Efficient generation of third harmonics in Yb-doped femtosecond fiber laser via spatial and temporal walk-off compensation [Early Posting]
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-BaB2O4 (BBO) 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 infrared to ultraviolet (UV).
作者单位：Ultrafast Laser Laboratory, Key Laboratory of Opto-electronic Information Science and Technology of Ministry of Education, School of Precision Instruments and Opto-electronics Engineering
Zhang Meng,Chu Yuxi,Zhao Jun,Yan Dongyu,Li Yongzhi,Bi Genyu,Liu Bowen,Hu Minglie. Efficient generation of third harmonics in Yb-doped femtosecond fiber laser via spatial and temporal walk-off compensation[J].Chinese Optics Letters,2021,19(3):03.