Jia Wei, Zhou Changhe, Feng Jijun, Dai Enwen
Information Optics Laboratory Shanghai Institute of Optics and Fine Mechanics, Academia Sinica, P. O. Box 800-211, Shanghai 201800, China.
Appl Opt. 2008 Nov 10;47(32):6058-63. doi: 10.1364/ao.47.006058.
We propose a miniature pulse compressor that can be used to compensate the group velocity dispersion that is produced by a commercial femtosecond laser cavity. The compressor is composed of two identical highly efficient deep-etched transmissive gratings. Compared with prism pairs, highly efficient deep-etched transmissive grating pairs are lightweight and small. With an optimized groove depth and a duty cycle, 98% diffraction efficiency of the -1 transmissive order can be achieved at a wavelength of 800 nm under Littrow conditions. The deep-etched gratings are fabricated in fused silica by inductively coupled plasma etching. With a pair of the fabricated gratings, the input positively chirped 73.9 fs pulses are neatly compressed into the nearly Fourier transform-limited 43.2 fs pulses. The miniature deep-etched grating-based pulse compressor should be of interest for practical applications.
我们提出了一种微型脉冲压缩器，可用于补偿商用飞秒激光腔产生的群速度色散。该压缩器由两个相同的高效深蚀刻透射光栅组成。与棱镜对相比，高效深蚀刻透射光栅对重量轻且体积小。通过优化槽深和占空比，在 Littrow 条件下，波长为 800 nm 时，-1 透射级的衍射效率可达到 98%。深蚀刻光栅通过电感耦合等离子体蚀刻在熔融石英中制造。使用一对制造的光栅，输入的正啁啾 73.9 fs 脉冲被整齐地压缩为近傅里叶变换极限的 43.2 fs 脉冲。这种基于微型深蚀刻光栅的脉冲压缩器在实际应用中应该会受到关注。
