Radially Polarized and Passively Q-Switched Nd:YAG Laser Under Annular-Shaped Pumping

Author

Zhiqiang Fang ; Kegui Xia ; Yao Yao ; Jianlang Li

Author_Institution

Shanghai Inst. of Opt. & Fine Mech., Shanghai, China

Volume

21

Issue

1

fYear

2015

fDate

Jan.-Feb. 2015

Firstpage

337

Lastpage

342

Abstract

We reported, for the first time, a radially polarized and passively Q-switched Nd:YAG laser with annular-shaped pumping. The annular intensity profile of the pump light was originated from the mode conversion in a conventional multi-mode fiber under off-focus coupling. Radially polarized pulse from this laser had 3.3 kW peak power, 39 ns duration at 2.5-kHz repetition rate with ~90% degree of polarization. When the laser crystal was slightly tilted, the polarization state of laser beam was switched to azimuthal polarization at high pump power, while remained radial polarization at lower pump power.

Keywords

Q-switching; laser beams; light polarisation; neodymium; optical pumping; solid lasers; YAG:Nd; annular intensity profile; annular-shaped pumping; azimuthal polarization; frequency 2.5 kHz; laser beam; laser crystal; mode conversion; multimode fiber; off-focus coupling; passively Q-switched Nd:YAG laser; polarization state; pump light; pump power; radially polarized Q-switched Nd:YAG laser; radially polarized pulse; repetition rate; time 39 ns; Fiber lasers; Laser beams; Laser excitation; Laser modes; Measurement by laser beam; Power lasers; Pump lasers; Beam reshaping; passively Q-switched laser; step-index fiber; thermaloptic effects; vector laser beam;

fLanguage

English

Journal_Title

Selected Topics in Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

1077-260X

Type

jour

DOI

10.1109/JSTQE.2014.2325216

Filename

6817513