202 W dual-end-pumped Tm:YLF laser with a VBG as an output coupler. (27th August 2021)

• Record Type: Journal Article
• Authors: Wei, Disheng; Mi, Shuyi; Yang, Ke; Li, Junhui; Tang, Jinwen; Yao, Baoquan; Dai, Tongyu; Duan, Xiaoming
• Is Part Of: High power laser science and engineering. Volume 9(2021)
• Publication Date: 2021-08-27
• Subjects: hundred watt level -- reflecting volume Bragg grating -- Tm:YLF laser; High power lasers -- Periodicals; 621.366
• DOI: 10.1017/hpl.2021.37
• Languages: English
• ISSNs: 2095-4719

Abstract

Abstract: We demonstrated a 202 W Tm:YLF slab laser using a reflecting volume Bragg grating (VBG) as an output coupler at room temperature. Two kinds of active heat dissipation methods were used for the VBG to suppress the shift of wavelength caused by its increasing temperature. The maximum continuous wave (CW) output power of 202 W using the microchannel cooling was obtained under the total incident pump power of 553 W, the corresponding slope efficiency and optical-to-optical conversion efficiency were 39.7% and 36.5%, respectively. The central wavelength was 1908.5 nm with the linewidth (full width at half maximum) of 0.57 nm. Meanwhile, with the laser output increasing from 30 to 202 W, the total shift was about 1.0 nm, and the wavelength was limited to two water absorption lines near 1908 nm. The beam quality factors M 2 were measured to be 2.3 and 4.0 in x and y directions at 202 W.