Radially polarized and passively Q-switched fiber laser.
We report, for the first time to our knowledge, a radially polarized and passively Q-switched Yb-doped fiber laser. By using a Cr(4+):YAG crystal as a saturable absorber and a photonic crystal grating as a polarization mirror, a radially polarized pulse is produced, which has 202 W of peak power, 75 ns duration, and ~92% polarization purity at a 56.6 kHz repetition rate. The Q-switched pulse with radial polarization from the fiber laser would facilitate numerous applications.
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
Di
D
Lin
Kegui
K
Xia
Ruxin
R
Li
Xiaojun
X
Li
Guoqiang
G
Li
Ken-ichi
K
Ueda
Jianlang
J
Li