Improvement of 2.79-μm laser performance on laser diode side-pumped GYSGG/Er,Pr: GYSGG bonding rod with concave end-faces

doi:10.1088/1674-1056/ab4ce0

Abstract A comparative study on the laser performance between bonding and non-bonding Er,Pr:GYSGG rods side-pumped by 970-nm laser diodes (LDs) is conducted for the thermal lensing compensation. The analyses of the thermal distribution and thermal focal length show that the bonding rod possesses a high cooling efficiency and weak thermal lensing effect compared with the conventional Er,Pr:GYSGG rod. Moreover, the laser characteristics of maximum output power, slope efficiency, and laser beam quality of the bonding rod with concave end-faces operated at 2.79 μm are improved under the high-repetition-rate operation. A maximum output power of 13.96 W is achieved at 150-Hz and 200-μs pulse width, corresponding to a slope efficiency of 17.7% and an electrical-to-optical efficiency of 12.9%. All results suggest that the combination of thermal bonding and concave end-face is a suitable structure for thermal lensing compensation.

Keywords: laser performance GYSGG/Er Pr:GYSGG bonding rod thermal lensing compensation concave end-faces

Received: 27 June 2019
Revised: 28 September 2019
Accepted manuscript online:

PACS:	42.62.Fi	(Laser spectroscopy)
	42.70.Hj	(Laser materials)
	68.60.Dv	(Thermal stability; thermal effects)
	81.65.Ps	(Polishing, grinding, surface finishing)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51872290, 51702322, and 51802307) and the National Key Research and Development Program of China (Grant No. 2016YFB1102301).

Corresponding Authors: Dun-Lu Sun
E-mail: dlsun@aiofm.ac.cn

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Xu-Yao Zhao(赵绪尧), Dun-Lu Sun(孙敦陆), Jian-Qiao Luo(罗建乔), Hui-Li Zhang(张会丽), Zhong-Qing Fang(方忠庆), Cong Quan(权聪), Lun-Zhen Hu(胡伦珍), Zhi-Yuan Han(韩志远), Mao-Jie Cheng(程毛杰), Shao-Tang Yin(殷绍唐) Improvement of 2.79-μm laser performance on laser diode side-pumped GYSGG/Er,Pr: GYSGG bonding rod with concave end-faces 2019 Chin. Phys. B 28 114208

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Improvement of 2.79-μm laser performance on laser diode side-pumped GYSGG/Er,Pr: GYSGG bonding rod with concave end-faces

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