161 W middle infrared ZnGeP2 MOPA system pumped by 300 W-class Ho:YAG MOPA system

We demonstrated a high-power switched two-stage Ho:YAG master-oscillator power-amplifier (MOPA) system dual-end pumped by Tm:YLF lasers. A new method was introduced by rotating and swapping spatial axial directions of pump beams to improve the beam quality of the Ho:YAG oscillator and first-stage am...

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Veröffentlicht in:	Optics letters 2021-01, Vol.46 (1), p.82-85
Hauptverfasser:	Liu, Gaoyou, Mi, Shuyi, Yang, Ke, Wei, Disheng, Li, Junhui, Yao, Baoquan, Yang, Chao, Dai, Tongyu, Duan, Xiaoming, Tian, Lixin, Ju, Youlun
Format:	Artikel
Sprache:	eng
Schlagworte:	Amplifiers Axial flow pumps Optics Physical Sciences Pulse repetition frequency Q factors Science & Technology YLF lasers
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Zusammenfassung:	We demonstrated a high-power switched two-stage Ho:YAG master-oscillator power-amplifier (MOPA) system dual-end pumped by Tm:YLF lasers. A new method was introduced by rotating and swapping spatial axial directions of pump beams to improve the beam quality of the Ho:YAG oscillator and first-stage amplifier. Two parallel second-stage Ho:YAG amplifiers were employed to output high power. A total maximum average output power of 332 W at 2091 nm with pulse repetition frequency of 20 kHz was achieved. Then a ZnGeP2 MOPA system was demonstrated using the Ho:YAG MOPA as the pump source. A maximum average output power of 161 W at 3-5 mu m was obtained with 290 W incident Ho pump power, corresponding to beam quality factors M-2 of 3.42 and 3.83 for horizontal and vertical directions, respectively. (C) 2020 Optical Society of America
ISSN:	0146-9592 1539-4794
DOI:	10.1364/OL.413755