Title :
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
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;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2014.2325216
