基于反射式达曼光栅的频率分辨光学开关装置

刘文军; 李国伟; 戴恩文; 周常河

中国激光, 2007, 34 (8): 1136, 网络出版: 2007-09-05

基于反射式达曼光栅的频率分辨光学开关装置

Frequency-Resolved Optical Gating Using Refractive Dammann Gratings

论文大纲

刘文军 ^1,2,*李国伟 ²戴恩文 ²周常河 ²

作者单位

¹ 哈尔滨工业大学威海校区光电科学系, 山东威海 264209

² 中国科学院上海光学精密机械研究所, 上海 201800

光栅飞秒激光频率分辨光学开关法达曼光栅 gratings femtosecond laser pulse frequency-resolved optical gating Dammann grating

摘要

采用反射式达曼光栅对飞秒激光进行分束,可以避免材料色散的影响。搭建了利用反射式1×2达曼光栅为基础的频率分辨光学开关(FROG)装置,并把测量结果与传统多发频率分辨光学开关装置的测量结果进行了对比。理论和实验结果表明,当输入脉冲宽度大于50 fs时,用达曼光栅作为分光器和使用分光镜分光的效果是一样的;当输入脉冲的宽度小于50 fs时,用达曼光栅作为分光器引入的展宽量明显小于分光镜引入的展宽量,尤其是当输入脉冲的宽度小于20 fs时用达曼光栅作为分光器的效果更为突出。

Abstract

A 1×2 array Dammann grating beam splitter for implementation of frequency resolved optical gating (FROG) is proposed. Beam splitting with Dammann grating can avoid the material dispersion in traditional beam splitters. The measuring result by the newly established FROG is compared with that of a traditional multi-pulse FROG. Theoretical and experimental results show that when the input pulse width is larger than 50 fs, the pulse broadening introduced by Dammann grating and general beam splitter is almost identical; but when the input pulse is shorter than 50 fs, the broadening effect of Dammann grating is obviously less than that introduced by general beam splitter, especially for laser pulses shorter than 20 fs.

参考文献

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刘文军, 李国伟, 戴恩文, 周常河. 基于反射式达曼光栅的频率分辨光学开关装置[J]. 中国激光, 2007, 34(8): 1136. 刘文军, 李国伟, 戴恩文, 周常河. Frequency-Resolved Optical Gating Using Refractive Dammann Gratings[J]. Chinese Journal of Lasers, 2007, 34(8): 1136.

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