300 W two-stage Nd:YAG Innoslab microsecond amplifier

Xuguang Zhang; Xuguang Zhang; Xuguang Zhang; Junzhi Ye; Junzhi Ye; Xingwang Luo; Xingwang Luo; Xingwang Luo; Xiaoming Chen; Xiaoming Chen; Xiaoming Chen; Lei Zhang; Lei Zhang; Xiafei Xu; Xiafei Xu; Huaijin Ren; Huaijin Ren; Yanhua Lu; Yanhua Lu; Yi Ma; Yi Ma; Qingsong Gao; Qingsong Gao; Jun Sun; Jun Sun; Jun Sun; Weimin Wang; Weimin Wang

doi:10.1364/AO.414813

Applied Optics
Vol. 60,
Issue 4,
pp. 971-975
(2021)
•https://doi.org/10.1364/AO.414813

300 W two-stage Nd:YAG Innoslab microsecond amplifier

Xuguang Zhang, Junzhi Ye, Xingwang Luo, Xiaoming Chen, Lei Zhang, Xiafei Xu, Huaijin Ren, Yanhua Lu, Yi Ma, Qingsong Gao, Jun Sun, and Weimin Wang

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Xuguang Zhang, Junzhi Ye, Xingwang Luo, Xiaoming Chen, Lei Zhang, Xiafei Xu, Huaijin Ren, Yanhua Lu, Yi Ma, Qingsong Gao, Jun Sun, and Weimin Wang, "300 W two-stage Nd:YAG Innoslab microsecond amplifier," Appl. Opt. 60, 971-975 (2021)

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Abstract

In this paper, a two-stage partially pumped slab (Innoslab) microsecond amplifier at 1064 nm is reported. The 4.4-W single-frequency seed laser is amplified to 303.6 W, with an overall optical–optical efficiency of 25.7%. The overlapping efficiency of the first- and second- amplifier stage is 67% and 55.6%, respectively. The pulse width is 145.0 µs, at a repetition rate of 500 Hz, and the beam quality factor of ${M^2}$ is 1.84 and 1.71 in the horizontal and vertical directions, respectively. With higher overlap between the pump volume and the seed laser mode, the output power and optical–optical efficiency can be further improved.

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Parameters	Seed Laser	First Stage	Second Stage
Laser crystal	–	Nd:YAG	Nd:YAG
Nd ( $3 +$ ) doping level	–	0.8 at.%	0.5 at.%
Crystal size	–	$15 \times 10 \times 2 {m m}^{3}$	$22 \times 15 \times 2.5 {m m}^{3}$
Pump beam size	–	$15 \times 0.6 {m m}^{2}$	$22 \times 1.2 {m m}^{2}$
Maximum average pump/seed power at 500 Hz and 170 µs	4.4 W	$\sim 440 W$	$\sim 720 W$
Number of passes in crystal	–	5	2
Length of cavity	–	150 mm	–
Beam quality ( $M^{2}$ )	$1.17 (x) / 1.21 (y)$	–	–

Parameters	First Stage		Second Stage
Pulse width	130.2 µs	144.2 µs	131.1 µs	145 µs
Output power	107.2 W	134.4 W	235.5 W	303.6 W
Optical–optical efficiency	28.7%	29.7%	20.6%	23.2%
Beam quality ( $M^{2}$ )	–	$1.4 (x)$	–	$1.84 (x)$
		$1.4 (y)$		$1.71 (y)$
Power stability (RMS)	–	–	–	0.4%
Linear polarization degree	–	–	–	15 dB

Parameters	Seed Laser	First Stage	Second Stage
Laser crystal	–	Nd:YAG	Nd:YAG
Nd ( $3 +$ ) doping level	–	0.8 at.%	0.5 at.%
Crystal size	–	$15 \times 10 \times 2 {m m}^{3}$	$22 \times 15 \times 2.5 {m m}^{3}$
Pump beam size	–	$15 \times 0.6 {m m}^{2}$	$22 \times 1.2 {m m}^{2}$
Maximum average pump/seed power at 500 Hz and 170 µs	4.4 W	$\sim 440 W$	$\sim 720 W$
Number of passes in crystal	–	5	2
Length of cavity	–	150 mm	–
Beam quality ( $M^{2}$ )	$1.17 (x) / 1.21 (y)$	–	–

Parameters	First Stage		Second Stage
Pulse width	130.2 µs	144.2 µs	131.1 µs	145 µs
Output power	107.2 W	134.4 W	235.5 W	303.6 W
Optical–optical efficiency	28.7%	29.7%	20.6%	23.2%
Beam quality ( $M^{2}$ )	–	$1.4 (x)$	–	$1.84 (x)$
		$1.4 (y)$		$1.71 (y)$
Power stability (RMS)	–	–	–	0.4%
Linear polarization degree	–	–	–	15 dB

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Applied Optics