Efficient generation of third harmonics in Yb-doped femtosecond fiber laser via spatial and temporal walk-off compensation  

作　　者：Meng Zhang Yuxi Chu Jun Zhao Dongyu Yan Yongzhi Li Genyu Bi Bowen Liu Minglie Hu 张萌;储玉喜;赵君;闫东钰;李永智;毕根毓;刘博文;胡明列(Ultrafast Laser Laboratory,Key Laboratory of Opto-electronic Information Science and Technology of Ministry of Education,School of Precision Instruments and Opto-electronics Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]Ultrafast Laser Laboratory,Key Laboratory of Opto-electronic Information Science and Technology of Ministry of Education,School of Precision Instruments and Opto-electronics Engineering,Tianjin University,Tianjin 300072,China

出　　处：《Chinese Optics Letters》2021年第3期69-73,共5页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (NSFC) (Nos. 61805174 and U1730115);Natural Science Foundation of Tianjin (No. 20JCQNJC01180);Research and Development Program in Key Areas of Guangdong Province, China (No. 2020B090922004)。

摘　　要：On the basis of a home-made femtosecond Yb-doped fiber laser, we designed a compact and efficient third harmonic generation scheme by a simple compensation plate of β-Ba B2O4 crystal. The compensation plate is optimized through its thickness and cutting angle to reverse both spatial and temporal walk-off. By optimizing the parameters of the compensation plate and incident light intensity, a maximum output of 2.23 W with a repetition rate of 1 MHz at 345 nm is obtained, which implies a conversion efficiency of 23% from the infrared to ultraviolet.

关 键 词：ultrafast nonlinear optics harmonic generation and mixing ULTRAVIOLET compensation plates 

分 类 号：TN248[电子电信—物理电子学]