Open Access7kW direct-liquid-cooled side-pumped Nd:YAG multi-disk laser resonator
Author(s) -
Ke Wang,
Bo Tang,
Chunyan Jia,
Jianli Shang,
Xiangchao An,
Yongli Liao,
Zhi Xu,
Jingwei Guo,
Yi Jiang,
Yi Yu,
Hua Su,
Qingsong Gao,
Xiaojun Wang,
Wanfa Liu,
Kai Zhang
Publication year - 2016
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.015012
Subject(s) - optics , materials science , laser , thin disk , resonator , slope efficiency , disk laser , brewster's angle , energy conversion efficiency , laser power scaling , optoelectronics , fiber laser , physics , stars , brewster , astronomy
A direct-liquid-cooled side-pumped Nd:YAG multi-disk QCW laser resonator is presented, in which the oscillating laser propagates through multiple thin disks and cooling flow layers in Brewster angle. Twenty Nd:YAG thin disks side-pumped by LD arrays are directly cooled by flowing deuteroxide at the end surfaces. A laser output with the highest pulse energy of 17.04 J is obtained at the pulse width of 250 μs and repetition rate of 25 Hz, corresponding to an optical-optical efficiency of 34.1% and a slope efficiency of 44.5%. The maximum average output power of 7.48 kW is achieved at the repetition rate of 500 Hz. Due to thermal effects, the corresponding optical-optical efficiency decreases to 30%. Under the 12.5 kW pumping condition while not oscillating, the wavefront of a He-Ne probe passing through the gain module is as low as 0.256 μm (RMS) with the defocus and tetrafoil subtracted.