Frequency-domain "single-shot" (FDSS) transient absorption spectroscopy using a variable-length grating pair compressor

Asymmetric four-grating compressor for ultrafast high power lasers

The peak power improvement and running safety of petawatt (PW) lasers are limited by laser-induced damage of optical components with limited sizes and damage thresholds. Diffraction gratings in pulse compressors have been the shortest stave of PW lasers up to now, as to manufacture a high quality meter-sized grating remains particularly challenging. Here, the asymmetric four-grating compressor (AFGC) with asymmetric configuration is proposed for PW lasers to increase the maximum bearable output pulse energy and running safety without neither additional optical component nor extra control in co…

降低对称和非对称压缩器中的激光束通量与强度波动

Reducing laser beam fluence and intensity fluctuations in symmetric and asymmetric compressors

本文解析研究了非对称双光栅对压缩器中的时空耦合效应，发现其不改变远场通量，但通过空间噪声滞后或超前降低通量波动，并给出了仅依赖一个参数的波动谱与均方根表达式及自聚焦抑制效率。

用于10s到100s PW激光器的多步脉冲压缩器

A multistep pulse compressor for 10s to 100s PW lasers

针对高能拍瓦激光器中衍射光栅损伤阈值和尺寸限制脉冲压缩的问题，提出一种多步脉冲压缩器（MPC），通过棱镜对、四光栅压缩器和时空聚焦自压缩器修改时空特性，实现单束100 PW或双束超150 PW激光输出，并简化系统提高稳定性。

Multistage smoothing based multistep pulse compressor for ultrahigh peak power lasers

Ultrahigh peak power lasers are important scientific tools for frontier laser-physics researches, in which both the peak power improvement and operating safety are very important meanwhile limited by the damage threshold and size of compression gratings currently. Based on a recent reported method "multistep pulse compressor (MPC)", a multistage smoothing based MPC (MS-MPC) is proposed here to further improve the running safety, operating convenience, and simplify the whole setup of the MPC. In this optimized design, the beam smoothing is not simply executed in the pre-compressor or main-compr…

Low-dispersion low-loss dielectric gratings for efficient ultrafast laser pulse compression at high average powers

We have developed low-dispersion (1480 l/mm), resonance-free, diffraction gratings made of dielectric materials resistant to femtosecond laser damage $(SiO_{2}/HfO_{2})$. A 14 cm diameter sample was fabricated resulting in a mean diffraction efficiency of 99.1% at λ = 810 nm with 0.4% uniformity using equipment which can fabricate gratings up to 1m diagonal. The implementation of these gratings in the compression of 30 fs pulses in an out-of-plane geometry can result in compressor efficiencies of ~95%. The measured laser absorption is 500x lower than current ultrafast petawatt-class compressor…

Beam smoothing based on prism pair for multistep pulse compressor in PW lasers

Ultra-short ultra-intense laser provides unprecedented experimental tools and extreme physical conditions to explore frontier secrets of nature. Recently, multistep pulse compressor (MPC) was proposed to break through the limitation of the size and damage threshold of the grating in the compressor during the realization of higher peak power laser. In the MPC methods, beam smoothing in the pre-compressor is a very important process. Here, beam smoothing based on prism pair were studied technically, in which both the spatial profiles and the spectral dispersive properties were analyzed in detail…

啁啾脉冲波导放大器

Chirped pulse waveguide amplifier

本文提出一种单模Cr:ZnS晶体波导超快放大器，利用超快激光写入的凹陷包层波导实现5.5 dB/cm增益和2.35 W平均输出功率，并通过解析模型优化设计，在CPA装置中验证了宽带高增益放大性能。