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Rapid and high precision measurement of opto-thermal relaxation with pump-probe method
Science Bulletin ( IF 18.9 ) Pub Date : 2018-02-05 , DOI: 10.1016/j.scib.2018.02.005
Tao Wang 1 , Xiao-Fei Liu 2 , Yunqi Hu 1 , Guoqing Qin 1 , Dong Ruan 1 , Gui-Lu Long 3
Affiliation  

Opto-thermal relaxation is one of the most important properties of nonlinear optical materials. Rapid and high precision measurement of this parameter is vital in both fundamental research and applications. Current measurement uses either complicated structure with poor precision or high power heating source with low efficiency. Here, we propose a pump-probe method (PPM) to optically measure the thermal relaxation using whispering gallery mode (WGM) microcavities. When the pump laser shines on a microcavity, the materials absorb the input power resonantly and heat up. Then the heat dissipates from the cavities to the surroundings. The opto-thermal effect induces a refractive index change reflected in the signal light transmission spectra. By analyzing the curve character of the transmission spectra of the signal response in the spontaneous relaxation process, the thermal relaxation time can be rapidly measured with high precision. Additionally, we systematically verify the PPM using microtoroids under various pump powers and at various locking points of the signal laser mode. The small rate of refractive index changes (∼10−8) can be discerned with an input pump power as low as 11.816 μW. Hence, the PPM can be used to detect refractive index perturbation, like gas or liquid sensing, temperature fluctuations with ultra-high sensitivity and be applied to optical materials analysis efficiently.



中文翻译:

泵浦探针法快速高精度测量光热弛豫

光热弛豫是非线性光学材料最重要的特性之一。该参数的快速和高精度测量在基础研究和应用中都至关重要。电流测量要么使用结构复杂精度差,要么使用大功率加热源效率低下。在这里,我们提出了一种泵浦探针方法 (PPM),以使用回音壁模式 (WGM) 微腔光学测量热弛豫。当泵浦激光照射在微腔上时,材料共振吸收输入功率并升温。然后热量从空腔散发到周围环境。光热效应引起折射率变化,反映在信号光传输光谱中。通过分析自发弛豫过程中信号响应的透射光谱的曲线特征,可以快速、高精度地测量热弛豫时间。此外,我们在各种泵浦功率和信号激光模式的各种锁定点下使用微环系统地验证了 PPM。折射率变化率小(~10−8 ) 可以用低至 11.816 μW 的输入泵浦功率来识别。因此,PPM可用于超高灵敏度检测折射率扰动,如气体或液体传感、温度波动,并有效应用于光学材料分析。

更新日期:2018-02-05
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