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Flat-Top Pumped Multi-Millijoule Mid-Infrared Parametric Chirped-Pulse Amplifier at 10 kHz Repetition Rate
Laser & Photonics Reviews ( IF 11.0 ) Pub Date : 2021-04-27 , DOI: 10.1002/lpor.202000292
Xiao Zou 1 , Wenkai Li 1, 2 , Shizhen Qu 1 , Kun Liu 1 , Hao Li 3 , Qi Jie Wang 1, 4 , Ying Zhang 2 , Houkun Liang 2
Affiliation  

The advancement of mid-infrared (MIR) parametric amplification technique serves as the main driving force of multiple strong-field experiments in the frontier of science such as the generation of coherent soft X-ray and isolated attosecond pulses. However, the low parametric down-conversion efficiency especially in the MIR wavelength is a major bottleneck that hinders the further exploration of the MIR-laser-driven strong-field physics. Here, a simple and robust method that doubles the efficiency of a MIR optical parametric chirped-pulse amplifier (OPCPA) is reported, as a demonstration of the concept, through engineering a flat-top pump profile via high-efficiency diffractive optical elements. With the proposed flat-top pump scheme, a MIR OPCPA system at 3 μm and 10 kHz repetition rate with both the record pulse energy of 2.7 mJ and the highest average power at 27 W among the MIR OPCPAs with kHz repetition rate is demonstrated. This work provides a promising approach for achieving high energy high power MIR few-cycle lasers that can be readily used in emerging strong field experiments. In addition, it is believed that the developed technique in this work can become a general method of parametric efficiency enhancement, which is applicable to other nonlinear conversions and wavelength ranges.

中文翻译:

重复频率为 10 kHz 的平顶泵浦多毫焦中红外参量啁啾脉冲放大器

中红外(MIR)参量放大技术的进步是相干软X射线产生、孤立阿秒脉冲等多项科学前沿强场实验的主要推动力。然而,参数下变频效率低,尤其是在中红外波段,是阻碍中红外激光驱动强场物理进一步探索的主要瓶颈。在这里,报告了一种简单而可靠的方法,通过高效衍射光学元件设计平顶泵浦轮廓,将 MIR 光学参量啁啾脉冲放大器 (OPCPA) 的效率提高一倍,作为该概念的演示。使用所提出的平顶泵方案,MIR OPCPA 系统在 3 μm 和 10 kHz 重复率下均具有 2 的记录脉冲能量。7 mJ 和具有 kHz 重复率的 MIR OPCPA 中的最高平均功率为 27 W。这项工作为实现高能量高功率 MIR 少周期激光器提供了一种很有前途的方法,可以很容易地用于新兴的强场实验。此外,相信这项工作中开发的技术可以成为参数化效率增强的通用方法,适用于其他非线性转换和波长范围。
更新日期:2021-06-10
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