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Color-preserving visible and near-infrared image fusion for removing fog Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-28 Jing Wu, Peng Wei, Feng Huang
With the unavailability of scene depth information, single-sensor dehazing methods based on deep learning or prior information do not effectively work in dense foggy scenes. An effective approach is to remove the dense fog by fusing visible and near-infrared images. However, the current dehazing algorithms based on near-infrared and visible images experience color distortion and information loss. To
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Hyper-S3NN: Spatial–spectral spiking neural network for hyperspectral image classification Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-28 Jiangyun Li, Haoran Shen, Wenxuan Wang, Peixian Zhuang, Xi Liu, Tianxiang Zhang
Recently, convolutional neural networks (CNNs) have achieved an appealing performance in hyperspectral image (HSI) classification. Although CNNs excel at capturing local details, they fall short in modeling long-range dependencies due to small receptive fields. Spiking neural networks (SNNs) simulate the encoding and processing of information by the human brain, increasing the receptive field when
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On the defect detection limits of flash thermography in reflection mode: A comprehensive parametric 3D FE study Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-24 Gaétan Poelman, Saeid Hedayatrasa, Wim Van Paepegem, Mathias Kersemans
Optical flash thermography is a promising non-destructive testing technique which offers a fast, full-field and non-contact inspection. This study provides a comprehensive study into the influence of different factors on the physical defect detection limits of hidden defects with flash thermography, which is a missing key piece in the present literature.
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Generation of spatiotemporal dark pulse or polarization domain wall solitons in a partial multimode mode-locked fiber laser Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-22 Xiaoying Wang, Zhaokun Wang, Changyu Shen, Xuebin Zhang, Song Huang, Tiegang Guo
In this paper, we have experimentally investigated different operational states of a partial multimode Er-doped spatiotemporal mode-locked (STML) fiber laser. The STML is enabled by nonlinear multimode interference (NL-MMI) effect from the partial multimode cavity structure. It is found that by adjusting the multimode polarization controller (PC) and the pump power, the STML dark pulses, bright pulses
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Performance enhancement of thermal image analysis for noncontact cardiopulmonary signal extraction Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-22 Kohei Nakai, Masaki Kurosawa, Tetsuo Kirimoto, Takemi Matsui, Shigeto Abe, Satoshi Suzuki, Guanghao Sun
Infrared thermography (IRT) has emerged as a tool for the rapid and non-contact detection of febrile individuals in places of mass gathering. This study explores the feasibility of extracting cardiopulmonary signals (i.e., respiration and cardiac pulse signals) by analyzing thermal image sequences. A high IR spatial resolution (320 × 240 pixels) IRT was applied to acquire facial thermal image sequences
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Evidence for identification of acute myeloid leukemia using peripheral blood's infrared spectrum and logistic regression Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-21 Na Wang, Jie Wang, Leiying Xie, Ruobing Guo, Junli Duan, Kun Du, Changning Hao, Shaowei Wang
Invasive damage, poor prognosis and survival are problems for the traditional diagnostic and therapeutic methods of acute myeloid leukemia (AML), especially for the middle-aged and elderly. High sensitivity, less pain and fast speed are demands of AML diagnosis or long-term regular monitoring. Infrared (IR) spectroscopy has the potential to compensate for existing deficiencies and is explored in our
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Comprehensive exploration: Automatic mode-locking technology and its multidisciplinary applications Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-21 He Liu, Chenxi Sun, Haoran Zhang
We present a thorough review of the evolution and current status of automatic mode-locking technology, offering insights into its remarkable developments. Automatic mode-locking technology commences with traversal algorithms and genetic algorithms, progressing to machine learning. The advancements of optimization algorithms have ushered in a new era characterized by exceptional time efficiency, enhanced
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Non-linear frequency modulated thermal wave imaging for subsurface analysis Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-21 S.S. Banda, V.S. Ghali, G.T. Vesala, R. Mulaveesala
Thermographic analysis for subsurface non-destructive evaluation often encounters challenges in achieving better depth scanning and enhanced depth resolution. Usually, deeper depth analysis will be facilitated by the strength of the low-frequency components and the depth resolution on the frequency sweep of the stimulation, along with material properties in this active thermographic modality. Non-linear
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Self-equilibrium segmentation of near-infrared images of dental microcracks Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-20 Qiulei Zhang, Xin Wu, Lianming Wang, Jipeng Huang
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Maturity detection of single maize seeds based on hyperspectral imaging and transfer learning Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-20 Cheng Cui, Jingzhu Wu, Qian Zhang, Le Yu, Xiaorong Sun, Cuiling Liu, Yi Yang
Seed maturity is closely related to seed germination, seed storage and the yield of the next generation of crops and it is an important indicator of seed quality. Maize is an important food, feed, and industrial raw material crop in China. Hyperspectral imaging technology has the advantages of spectral technology and machine vision technology and it can obtain information inside and outside the seed
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Quantitative identification of debonding defects in building façades based on UAV-thermography using a two-stage network integrating dual attention mechanism Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-20 Qianxi Li, Xiong Peng, Xingu Zhong, Xinyi Xiao, Hui Wang, Chao Zhao, Kun Zhou
The debonding defects in building façades pose a serious threat to the safety of residents. In this paper, a two-stage quantitative network for debonding defect identification quickly and accurately based on deep learning is proposed. Firstly, the rotor UAV equipped with an infrared thermal imager is applied as the working platform to detect the debonding defects in building façades. Then, the target
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Passively mode-locked fiber lasers with broadband FeOOH saturable absorber Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-19 Mingchang Jiang, Hongwei Chu, Zhongben Pan, Han Pan, Shengzhi Zhao, Dechun Li
In this contribution, we synthesized iron oxide hydroxide (FeOOH) nanomaterials and successfully demonstrated the application of FeOOH-based saturable absorbers in ultrafast photonics at 1 μm and 1.5 μm. Various characterizations were conducted to analyze the morphological and structural features of FeOOH nanomaterials. Subsequently, a tapered fiber coated with FeOOH was integrated into the resonator
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Investigating the mechanism of infrared emissivity control in MgO doped YSZ based ceramics Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-15 Juhang Yin, Min Zhang, Tong Zhou, Yang Xiang, Wenzhuang Ma, Mian Zhong, Huazhong Zhang, Chao Zhou, Meng Han, Xiaoguang Tu, Li Zhang
Yttrium stabilized zirconia (YSZ) possesses notable thermal stability and high conductivity, rendering it indispensable in the realm of infrared stealth. While YSZ demonstrates relatively low emissivity within the 3–5 μm wavelength range, the escalating application temperatures of aircraft demand a further reduction in the infrared emissivity within this specific band, as per Wien displacement law
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Terahertz magneto-optical properties of Nitrogen-doped diamond Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-15 Huan Xiao, Hua Wen, Wen Xu, Yanzhe Cheng, Jing Zhang, Xingjia Cheng, Yiming Xiao, Lan Ding, Haowen Li, Bin He, Francois M. Peeters
Nitrogen-doped diamond (N-D) is one of the most important carbon-based electronic and optical materials. Here we study the terahertz (THz) magneto-optical (MO) properties of N-D grown by microwave plasma-enhanced chemical vapor deposition. The optical microscope, SEM, XRD, Raman spectrum, FTIR spectroscopy and XPS are used for the characterization of N-D samples. Applying THz time-domain spectroscopy
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Absorption coefficient and phase matching angle of KTiOAsO4 at low temperatures in terahertz range for high efficiency terahertz generation Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-15 Gaofang Li, Hanjing Ye, Jingguo Huang, Haoyang Cui, Nenghong Xia, Yanqing Gao, Zhiming Huang, Junhao Chu, Yury Andreev
The temperature dependence of absorption coefficient and phase matching (PM) angle of Potassium titanyl arsenate (KTiOAsO, KTA) with temperatures from 5.8 to 300 K was determined by terahertz time-domain spectroscopy. It is demonstrated that the absorption coefficient of KTA crystal exhibits a decrease with decreasing temperature, particularly the absorption coefficient along the axis changes more
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Real-time observation of dual-periodic dual-pulse synchronous and asynchronous pulsations in a spatiotemporal mode-locked fiber laser Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-15 Wen-Yao He, Guang-Xin Liu, Jia-Wen Wu, Guang-Xin Zhang, Wen-Jun Li, Hu Cui, Zhi-Chao Luo, Wen-Cheng Xu, Ai-Ping Luo
We report the firstly experimental observation of dual-periodic dual-pulse synchronous pulsation (DDSP) and dual-periodic dual-pulse asynchronous pulsation (DDAP) in a spatiotemporal mode-locked fiber laser, composed of a short-period pulsation (SPP) lasting for tens of round-trip times (RTs) and a long-period pulsation (LPP) lasting for hundreds of RTs. It is found that the DDSP displays in-phase
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Wavelength-tunable quasi-unidirectional spatiotemporal mode-locked solitons in an isolator-free Er-doped fiber laser Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-14 Song Huang, Zhaokun Wang, Changyu Shen, Xiaoying Wang, Jiapeng Huang
In this letter, we have demonstrated the realization of the wavelength-tunable spatiotemporal mode-locked (STML) operation in an Er-doped partial multimode fiber laser without the intracavity isolator. The laser adopts an all-fiber structure and the saturable absorption effect is attributed to nonlinear multimode interference (NL-MMI) from the single mode fiber-graded index multimode fiber-single mode
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Experimental study on infrared radiation and crack evolution characteristics during the failure process of rocks with pre-set crack Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-13 Longfei Chang, Lu Chen, Mingyuan Zhang, Dejian Li, Yingjun Li
The presence of fractures or discontinuities in rocks is a significant factor that contributes to safety concerns, including landslides, rock bursts, and underground water inflow, in engineering projects. Therefore, it is critical to obtain reliable precursor information during the rock failure and crack propagation. The infrared radiation and acoustic emission (AE) technology were combined to monitor
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Mo4/3B2T2/TiO2 vdW heterostructure as saturable absorber for ultrafast pulse generation Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-13 Yu Yang, Quan Wang, Yong Yao, Lin-guang Guo, Haoxue Qiu, Song-ting Li, Qian-chao Wu, Xiao-chuan Xu, Jia-jun Tian, Ke Xu
Van der Waals heterostructure have garnered significant interest in ultrafast laser generation because of their attractive saturable absorption properties, holding promise for application in optics, medicine, and optoelectronics. In this study, the saturable absorption properties of TiO, MoBT, and MoBT/TiO vdW heterostructure SAs are investigated. The integration of the SAs into the cavity reveals
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Deep soft threshold feature separation network for infrared handprint identity recognition and time estimation Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-12 Xiao Yu, Xiaojie Liang, Zijie Zhou, Baofeng Zhang, Hao Xue
With the development of hardware devices, infrared technology has become an important detection method in criminal investigation, military and other fields. Infrared technology can capture the thermal infrared information of targets, achieve efficient and rapid individual identification, provide important technological support for crime investigation, improve case solving rate and public safety level
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A baseline correction and noise suppression method based on fitting neural network for CH4/C2H6 dual gas sensing system Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-12 Yu Zhang, Qinduan Zhang, Jiachen Sun, Tingting Zhang, Yubin Wei, Weihua Gong, Zhaowei Wang, Yanfang Li
We designed a methane/ethane (CH/CH) dual-gas sensor on the basis of direct absorption spectroscopy (DAS) technology and explored the potential for low power consumption and miniaturization of the detection system using the effective optical range is only 25 cm for absorption cell and an uncooled photodetector. The problem of baseline drift introduced by uncooled photodetectors has been improved by
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Performance evaluation of the data transmission link with Bessel-Gaussian beams through a tunable smoke channel Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-12 Shuang He, Peng Zhang, Hang Chen, Hao Yu, Yuanxin Wang, Dongsheng Tian, Shoufeng Tong
We simulate and experimentally demonstrate a 1 Gbps free-space optical (FSO) communication system in a smoke chamber with the Bessel–Gaussian (BG) beam. Firstly, we simulate and analyze the attenuation and bit error rate (BER) of BG and Gaussian beams in the smoke channel based on the Monte Carlo method. The results show that BG beams have more advantages than Gaussian beams in smoke transmission.
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Artificial gorilla troops optimizer enfolded broad learning system for spatial-spectral hyperspectral image classification Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-11 Xiaoqing Wan, Feng Chen, Wu Liu, Yupeng He
The key challenge of hyperspectral image (HSI) classification is to develop effective feature representations for reducing intra-class variations while expanding inter-class differences. It is of great interest to exploit texture information in the preprocess stage for HSI classification by using feature extraction operators. Additionally, deep learning (DL) networks have focused on spatial-spectral
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Monitoring compositional changes in black soldier fly larvae after processing (drying and blanching) using near infrared spectroscopy Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-11 D. Cozzolino, S. Alagappan, M. Ochoa, S. Zhang, O. Yarger, L.C. Hoffman, D. Mikkelsen
Edible insects are characterised by their low environmental footprint compared with traditional sources of animal and plant proteins, due to their high feed conversion efficiency. The black solider fly () larvae have been one of the preferred candidates as alternative sources of protein due to their ability to add value to a wide range of organic waste streams. The ability to convert organic matter
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On-line monitoring of egg freshness using a portable NIR spectrometer combined with deep learning algorithm Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-11 Kunshan Yao, Jun Sun, Bing Zhang, Xiaojiao Du, Chen Chen
Monitoring and maintaining the freshness of eggs is important to ensuring a supply of eggs that is safe for consumption. Near infrared (NIR) spectrometer has been successfully applied to detect egg freshness. In recent years, a new generation of low-cost, miniaturized NIR sensors has been developed for on-line and in situ food analysis. The purpose of this study is to investigate the performance of
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Effective 3.5 μm emission of Er3+ ions in fluoroindate glass with improved thermal stability Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-10 Feifei Huang, Bingpeng Li, Bin Chen, Ying Tian, Junjie Zhang, Shiqing Xu
The development of effective 3.5 μm laser derived from a gain medium doped with Er ions is of great significance for research on mid-infrared (MIR) lasers. Existing 3.5 μm laser materials are unable to exhibit both stable thermal and excellent MIR optical properties simultaneously. In this study, a system of fluoroindate glasses was prepared and analyzed through differential scanning calorimetry (DSC)
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Infrared differential detection and band selection for space-based aerial targets under complex backgrounds Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-08 Lan Guo, Peng Rao, Xin Chen, Yejin Li
Space-based aerial target detection is an important branch of infrared remote sensing. Due to the complex background and dim target, the problem of low target detectability needs to be solved. This work introduces a novel infrared differential detection (IDD) method, which acquires information differences under multiple channels in a dimension. The paper further proposes a band selection methodology
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An electro-optic Q-switched Ho: YLF oscillator with adjustable pulse width Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-08 Hai Wang, Zhiyong Li, Hui Li, Zhenzhen Xie, Juntao Tian, Lili Zhao, Liemao Hu, Rongqing Tan
A pulse width adjustable 2.05 μm Q-switched Ho: YLF oscillator was demonstrated for the first time, to the best of our knowledge, with a configuration of double pockels cells. The pump source was a Tm: YAP solid-state laser with linear polarization. For a pump power of 61.53 W, a 32.5 mJ Ho laser with a pulse width of 19.2 ns and peak power of 1.69 MW was obtained at a pulse repetition frequency of
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Leafy vegetable freshness identification using hyperspectral imaging with deep learning approaches Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-08 Mengyu He, Cheng Li, Zeyi Cai, Hengnian Qi, Lei Zhou, Chu Zhang
With more attention being paid to healthy diets, vegetable freshness is a concerning issue for consumers and traders. Rapid and non-destructive evaluation of vegetable freshness plays an important role in vegetable consumption. In this study, hyperspectral imaging was used to identify the freshness of spinach and Chinese cabbage stored at different durations. Classification models were built using
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Flower pollination optimization based hyperspectral band selection using modified wavelet Gabor deep filter neural network Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-08 Anand R., Sathishkumar Samiappan, Kavitha K.R.
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Detection of Insect-Damaged Maize Seed Using Hyperspectral Imaging and Hybrid 1D-CNN-BiLSTM Model Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-07 Zheli Wang, Shuxiang Fan, Ting An, Chi Zhang, Liping Chen, Wenqian Huang
Maize ( L.) holds a pivotal position in various domains, making maize seeds' germination rate and quality crucial for agricultural production. Insect-infested seeds can impair their germination rate, resulting in substantial economic losses. Nevertheless, research on rapid detection methods for insect infestation in maize seeds remains insufficient. In this study, we employed hyperspectral data within
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NIRS prediction of the protein, fat, and ash of Sargassum fusiforme at different growth stages: A quality control approach Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-07 Jing Huang, Li Zeng, Sisi Wei, Haibin Tong, Xiaoliang Ji, Mingjiang Wu, Yue Yang
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Variable temperature BRDF measurement up to 1000 °C for highly reflective surfaces Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-06 Fanshan Meng, Ang Huang, Jinghui Wang, Shuai Huang, Qiang Liu, Li Yiwen
Bidirectional Reflectance Distribution Function (BRDF) under variable temperature conditions is important for target identification and stealth in aerospace applications of highly reflective materials. In this paper, a variable temperature BRDF measurement system based on a robotic arm with an ingenious heater is designed. For BRDF measurements of highly reflective surfaces, a scanning strategy with
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Research on denoising of second harmonic signal in photoacoustic spectroscopy based on SSA-VMD-WTD method Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-06 Xiaomeng Du, Qinduan Zhang, Yubin Wei, Tingting Zhang, Yu Zhang, Yanfang Li
Aiming at the problem that second harmonics generated in gas measurement by photoacoustic spectroscopy (PAS) technology based on photoacoustic effect are susceptible to noise. In this paper, a method based on Sparrow Search Algorithm (SSA) optimized Variational Mode Decomposition (VMD) combined with Wavelet Threshold Denoising (SSA-VMD-WTD) was proposed to identify and suppress the noise. Firstly,
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LMDFusion: A lightweight infrared and visible image fusion network for substation equipment based on mask and residual dense connection Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-06 Hao Chi, Delin Luo, Song Wang
Lightweight infrared and visible image fusion is a challenge problem for image-based fault detection. In this paper, a lightweight infrared and visible image fusion network is proposed based on mask and residual dense connection called LMDFusion. In this method, the loss function is designed by utilizing image masks to assist the training of the network, and the residual dense connection is used to
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Study on pulse characteristics of high-repetition-rate harmonic mode-locked laser utilizing PbSnS2 saturable absorber Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-06 Xiaohui Du, Pengpeng Wang, Shaokai Li, Chenyue Liu, Zefei Ding, Cunguang Zhu
This study explores the potential of lead-tin sulfide (PbSnS), a novel two-dimensional material, for optical applications. PbSnS has a narrow bandgap and excellent light absorption, yet research on the optical characterization of PbSnS is still in its infancy, especially in applying its saturable adsorption properties to ultrafast photonics. This work focuses on the pulse output characterization of
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Miniature diffusive mid-infrared photoacoustic gas sensor for carbon dioxide detection Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-06 Xijie Huang, Zhengzhi Wang, Jikuan Zhao, Yajie Zhang, Shaokai Jin, Chengcheng Song, Ke Chen
A low-cost miniature diffusive infrared photoacoustic (PA) sensor (MDIPS) was proposed and designed for the detection of carbon dioxide. To reduce the volume and the power consumption, the air pumps and air valves in the traditional PA sensing system were replaced by a breathable hole and filter membrane. Through finite element analysis, the radius of the optimized membrane was selected between 0.2
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Parallel-plate diffuse optical imaging in a tissue-like phantom through high signal-to-noise measurement Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-06 Jia Li, Lingzhen Yang, Hanlu Feng, Zhichao Shao, Yueling Hao, Weijie Ding, Juanfen Wang
In this paper, a parallel-plate diffuse optical imaging has been proposed and developed with chaotic laser. To evaluate the ability of the diffuse optical imaging system, a series of tissue-like phantoms are used to quantify the absorption coefficient and size of small inclusions. The propagation of a chaotic laser in the tissue-like phantom is studied theoretically and experimentally based on diffusion
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The design and calculation of the infrared properties for low emissivity coatings dependent on the structure and distribution of flake Al pigments Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-05 Yaqin Wang, Yuxi Huang, Le Yuan, Qiyun Zhu, Lun Qi, XueYu Wu, Xiaolong Weng
Flake Al pigment is the main component of infrared low emissivity coatings, which plays an important role in controlling the coating‘s infrared optical properties. To clarify this influence mechanism, the flake Al powder with controllable thickness and particle size were prepared by the method of physical vapor deposition combined with ultrasonic crushing. The effects of structure parameters for flake
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Q-switched mode-locked fiber laser based on the pump modulation technique Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-05 Dongdong Han, Yani Chen, Ruotong Guo, Boyuan Zhang, Tiantian Li, Kaili Ren, Yipeng Zheng, Lipeng Zhu, Lei Liang, Zhanqiang Hui
We demonstrate a stable Q-switched mode-locked (QML) erbium fiber laser using pump modulation techniques. A continuous-wave mode-locked operation is realized at a direct current pumping driver current. Stable QML pulses are generated when a modulation signal (square wave signal) is injected into the pump driver. As the parameters of the modulation signal (duty cycle or amplitude) are varied, the time
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FEPoinTr: Point cloud completion networks independent of batch size Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-03 Yuheng Gan, Guanghui Liu, Yun Feng, Xiaoping Yang
The point cloud data generated by LiDAR sensors has rich spatial geometry information, which is crucial for many fields. However, due to the limitations of the sensor, the point cloud with incomplete geometric information is usually obtained. To solve this problem, we propose FEPoinTr, which improves performance and reduces batch size dependency by introducing an FRN layer to normalize. In addition
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Distillation-fusion-semantic unified driven network for infrared and visible image fusion Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-03 Yang Jiang, Jiawei Li, Jinyuan Liu, Jia Lei, Chen Li, Shihua Zhou, Nikola K. Kasabov
Infrared and visible image fusion is critical in computer vision applications to integrate complementary information from input images into a single enhanced representation. However, existing infrared and visible image fusion approaches frequently overlook the joint requirements of feature transmission and advanced semantics. Consequently, they suffer from low feature utilization and weak generalization
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SDTFusion: A split-head dense transformer based network for infrared and visible image fusion Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-03 Shan Pang, Hongtao Huo, Xiaowen Liu, Bowen Zheng, Jing Li
Most of the current deep learning based image fusion methods heavily rely on convolutional operations for feature extraction. Recently, some Transformer-based image fusion models have emerged. However, most of them design complex attention mechanisms and still rely heavily on convolutions for local features modeling. With this goal, this paper proposes a novel and simple split-head dense Transformer
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Refractive index sensor based on bound states in the continuum in silicon-based metasurface Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-01-30 Jingjing Zhao, Xinye Fan, Wenjing Fang, Wenxing Xiao, Fangxin Sun, Chenglin Bai, Chuanchuan Li, Xin Wei, Santosh Kumar
This article theoretically and experimentally investigates a silicon-based metasurface composed of a silicon cuboid with two sector nanopores. The simulation results demonstrate that breaking symmetry into the unit structure can achieve the quasi-bound state in the continuum (quasi-BIC) resonance modes with high quality factor (Q-factor). The spectral responses based on different refractive index results
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Mid-wave infrared multispectral imaging by DOE Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-02 Haiquan Hu, Nan Xu, Hao Xu, Zhihai Xu, Qi Li, Huajun Feng, Yueting Chen
With the development of flat optics, the ability of optical elements to modulate the optical field has become increasingly powerful. Inspired by color router, we propose a method to achieve mid-wave infrared snapshot multispectral imaging using diffractive optical element which realizes wavelength splitting and focusing in a higher transmittance way. Based on a mid-wave infrared imaging system, multispectral
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Rapid THz time-of-flight imaging on single layer graphene for conductivity assessment Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-02 Young Chul Kim, Jong Hyuk Yim, Abbas Ahmad Khan, Jangsun Kim, Yeong Hwan Ahn
The assessment of the electrical conductivity of single-layer graphene (SLG) on flexible substrates is pivotal for the advancement of next-generation electronic devices. In this study, we introduce a novel approach utilizing a rapid terahertz time-of-flight (THz-ToF) imaging technique to nondestructively evaluate the conductivity of SLG films transferred onto plastic substrates. Operating at a pixel
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FAPbBr3/GaAs heterojunction saturable absorber for Nd:GdVO4 passively Q-switched lasers Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-02 Lingyu Jiang, Qixiao Sui, Deqing Niu, Lulu Gao, Yingjie Shen, Lige Liu, Qingliang Zhang, Ruijun Lan
The structural characteristics and saturable absorption properties of the FAPbBr/GaAs heterojunction saturable absorber were studied for the first time to the best of our knowledge. By comparing the passively Q-switched results based on FAPbBr/GaAs heterojunction and pure GaAs saturable absorbers, prominent improvements are observed in the heterojunction regime. The largest pulse energy and highest
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Ba2LaNbO6:Cr3+,Yb3+ double perovskite far-red and near-infrared phosphors for plant cultivation LEDs Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-02 Yuxin Pan, Kai Sun, Zhixian Tang, Xufeng Yao, Tiantian Pan, Hui Lin, Dawei Zhang, Xiaodong Xu, Ming Qiang
BaLaNbO:Cr,Yb double perovskite far-red and near-infrared phosphors were synthesized by high-temperature solid-state method. The crystal structure and optical properties were systematically investigated, encompassing PL, PLE, and temperature-dependent PL spectra. The calculated value D/B of BaLaNbO:0.005Cr phosphor was calculated to be 2.59, signifying a robust crystal field strength within the [NbO]
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2.09 μm single-frequency all-polarization-maintaining Ho-doped fiber laser based on dynamic Bragg grating frequency selection Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-02 Disheng Wei, JunHui Li, Jinwen Tang, Shuyi Mi, XiaoXiao Hua, Baoquan Yao, Tongyu Dai, Xiaoming Duan
We demonstrated a 2.09 μm single-frequency all-polarization-maintaining (all-PM) Ho-doped fiber (HDF) laser pumped by a 1940 nm Tm-doped fiber (TDF) laser. The oscillator employed a ring cavity scheme to enhance the net gain at the wavelength, with two circulators utilized to guarantee unidirectional laser operation and eliminate the spatial hole burning (SHB) effect in the gain fiber. An unpumped
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Q-switched laser operation of mixed vanadate crystal Nd:LuYLaVO4 Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-02 Qixiao Sui, Lingyu Jiang, Deqing Niu, Qingliang Zhang, Yingjie Shen, Ruijun Lan
The laser properties of Nd:LuYLaVO mixed crystal have been investigated in this study. To the best of our knowledge, the operations of passively and actively Q-switched lasers are realized by employing the Nd:LuYLaVO crystal as the gain medium, for the first time. In the passively Q-switched laser experiment, a pulse duration of 1.53 ns and a single pulse energy of 12.37 μJ are obtained, and the counterparts
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Minimize of moisture effects from laboratory simulations of in-situ Vis-NIR spectral for the prediction of soil salinity Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-02 Yu Wang, Bifeng Hu, Yongsheng Hong, Songchao Chen, Chengyi Zhao, Jie Peng
In-situ spectral is a superior means of determining soil properties than indoor spectral, but soil moisture (SM) has been a key limiting factor in the accuracy of in-situ spectral. The effective removal of the SM effects is an ongoing challenge for in-situ spectral of soil properties. The present studies have typically focused on SM removal only for a smaller SM interval, but there is a wide range
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Analysis of field evolution and regulation inside a microcavity with thermal effect Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-02 Xin Xu, Huichun Ye, Chen Jiao, Xueying Jin, Chengliang Pan, Dong Chen, Haojie Xia
The influence of thermal effects on the field within the microcavity has been investigated. Results show that these thermal effects can induce thermal detuning, which promotes the excitation of solitons under initial conditions of zero detuning. However, the occurrence of soliton generation during the thermal process is contingent upon the intensity of the pump power. Low pump power enhances soliton
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Tunable dual-wavelength laser based on cascaded stimulated polariton scattering Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-01 Feilong Gao, Qi Song, Yiyan Xie, Yiran Wang, Xiancui Su, Guoru Li, Bingyuan Zhang, Santosh Kumar
We demonstrate a tunable dual-wavelength laser with two Stokes cavities by combining two stimulated polariton scattering (SPS) effects. The 1064 nm laser is initially generated through diode-side-pumping a Nd:YAG laser crystal. Subsequently, the first Stokes wave is obtained using a MgO:LiNbO crystal, and its wavelength can be continuously tunable. Once the first Stokes wave within the cavity reaches
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Passive mode locking erbium-doped fiber laser based on topological semimetal TaP quantum dots Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-01 Yan-Xian Xu, Hui Long, Min-Ru Wen, Hua-Feng Dong, Li-Li Tao, Fu-Gen Wu, Li Chen
The novel semimetal tantalum phosphide (TaP) is known for its notable physical property including high carrier mobility, zero bandgap structure and superconductivity. However, there is no prior record of TaP as a saturable absorber (SA) within ultrafast fiber lasers. In this study, ultrasound assisted liquid phase exfoliation is applied to fabricate TaP quantum dots (QDs). Then QDs are subsequently
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Efficient and wavelength-tunable mid-infrared fluoride fiber laser modulated by CsxWO3 nanocrystals Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-01 Tiantian Zhou, Yuan He, Lingling Yang, Ning Li, Jing Huang, Dongyang Liu, Yuanyuan Gou, Lili Miao, Chujun Zhao
The performance of the nanosecond mid-infrared fluoride fiber laser suffers from the unqualified nonlinear optical modulator operating in the mid-infrared regime. Here, we found that the CsWO nanocrystals (NCs), a cost-effective near-infrared absorber for solar filter coatings, show broadband nonlinear optical (NLO) response in the 3–6 μm regime, and demonstrated an efficient wavelength-tunable nanosecond
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Room-temperature MoTe2/InSb heterostructure large-area terahertz detector Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-02-01 Jiatong Wang, Min Zhang, Zhiwen Zhou, Ling Li, Qi Song, Peiguang Yan
As a building block for terahertz system, terahertz detector is expected to achieve high-performance, room-temperature, low-cost and large-area detection available. However, the state-of-the-art technologies still suffer from various drawbacks. This paper presents a MoTe/InSb heterostructure large-area terahertz detector. With the photoactive region of heterostructure, carriers are allowed to assemble
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Cylindrical vector beam generation from a hybrid multimode Q-switched mode-locked fiber laser Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-01-27 Lu Wan, Tao Zhou, Jing Liu, Chao-Qing Dai, Hui-Cong Zhang
We demonstrate a hybrid multimode Q-switched mode-locked fiber laser capable of delivering cylindrical vector beams (CVBs). The wavelength-tunable Q-switching, conventional mode-locking, Q-switched mode-locking (QML), and CVB generation under QML operation are respectively achieved in this hybrid multimode cavity. The mode-locking mechanism is based on carbon nanotubes as saturable absorber and two
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Silicon compact microdisk resonators using phase change material for photonic memory and logic gate Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-01-26 Binbin Chen, Yegang Lu, Xu Yan
Microdisk resonators (MDRs) have emerged as promising elements in silicon photonic systems due to their small mode volume, high-quality factor, and ease of fabrication. Although MDRs can support multiple radial mode transmissions, this can result in crosstalk and loss between modes, thereby hindering improvements in device performance and scalability of the array. This paper presents an innovative
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Wavelength-dependent optical nonlinear response of vanadium diselenide Infrared Phys. Technol. (IF 3.3) Pub Date : 2024-01-24 Jing Huang, Yayuan Tang
The wavelength-dependent and ultrafast nonlinear optical response of vanadium diselenide (VSe2) in the visible to near-infrared spectrum are experimentally investigated, which shows broadband saturation absorption and self-focusing characteristics, and obtained the maximum nonlinear absorption coefficient and nonlinear absorption coefficient are −4.058 × 10−10 m/W and 6.043 × 10−17 m2/W, respectively