High-dispersive mirror for pulse stretcher in femtosecond fiber laser amplification system  

作　　者：Wenjia Yuan Weidong Shen Chen Xie Chenying Yang Yueguang Zhang 袁文佳;沈伟东;谢辰;杨陈楹;章岳光(State Key Laboratory of Modern Optical Instrumentation,College of Optical Science and Engineering,Zhejiang University,Hangzhou 310027,China;Ultrafast Laser Laboratory,Key Laboratory of Opto-electronic Information Science and Technology of Ministry of Education,College of Precision Instruments and Opto-Electronics Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]State Key Laboratory of Modern Optical Instrumentation,College of Optical Science and Engineering,Zhejiang University,Hangzhou 310027,China [2]Ultrafast Laser Laboratory,Key Laboratory of Opto-electronic Information Science and Technology of Ministry of Education,College of Precision Instruments and Opto-Electronics Engineering,Tianjin University,Tianjin 300072,China

出　　处：《Chinese Physics B》2022年第8期627-630,共4页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.61705194)。

摘　　要：We present a high-dispersive multilayer mirror for pulse stretching in a femtosecond fiber laser amplification system.The designed mirror contains 54 layers with a total physical thickness of 7.3 μm, which can provide a positive group delay dispersion(GDD) of 600 fs2and a high reflectance over 99.9% from 1010 to 1070 nm. The samples were prepared by dual ion beam sputtering. The measured transmittance matches well with the theoretical result. The GDD characteristics of samples were tested by home-made white light interferometer. The measured GDD is higher than the design results,an average GDD of +722 fs2from 1010 nm to 1070 nm. The mirrors were employed in a Yb-doped large-mode-area photonic crystal fiber amplification system. An input pulse compressed by the gratings with autocorrelation function of83 fs is obtained with a stretched FWHM of 1.29 ps after 28 bounces between the dispersive mirrors. The results show that the multilayer dispersive mirror could be an effective and promising technique for pulse stretching in femtosecond amplification systems.

关 键 词：optical coatings dispersive mirror ultrafast optics pulse stretching 

分 类 号：TN24[电子电信—物理电子学] TH74[机械工程—光学工程]