Configuration to improve second-harmonic-generation conversion efficiency.
The dependence of second-harmonic-generation (SHG) conversion efficiency on the intercrystal phase shift between two nonlinear crystals is analyzed with heuristic theory, and a novel scheme for SHG with two cascaded nonlinear crystals and a polarization modulator is proposed. More than 30 W output power is obtained experimentally at 532 nm with 70% external doubling efficiency. To the best of our knowledge, this is the highest conversion efficiency obtained with LiB3O5 crystal external frequency doubling. This scheme provides a simple and effective method for improving second-harmonic conversion efficiency.
Bi
Yong
Y
Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China. biyong92184@hotmail.com
Li
Ruining
R
Sun
Zhipei
Z
Zhang
Ying
Y
Lin
Xuechun
X
Zhang
Hongbo
H
Xu
Zuyan
Z