Effect of laser pulse duration and fluence on DKDP crystal laser conditioning

Zhichao Liu; Feng Geng; Xiangyang Lei; Yaguo Li; Jian Cheng; Yi Zheng; Jian Wang; Qiao Xu

doi:10.1364/AO.393097

Applied Optics
Vol. 59,
Issue 17,
pp. 5240-5246
(2020)
•https://doi.org/10.1364/AO.393097

Effect of laser pulse duration and fluence on DKDP crystal laser conditioning

Zhichao Liu, Feng Geng, Xiangyang Lei, Yaguo Li, Jian Cheng, Yi Zheng, Jian Wang, and Qiao Xu

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Zhichao Liu, Feng Geng, Xiangyang Lei, Yaguo Li, Jian Cheng, Yi Zheng, Jian Wang, and Qiao Xu, "Effect of laser pulse duration and fluence on DKDP crystal laser conditioning," Appl. Opt. 59, 5240-5246 (2020)

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Table of Contents Category
- Lasers, Optical Amplifiers, and Laser Optics
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About this Article
History
- Original Manuscript: April 14, 2020
- Revised Manuscript: May 8, 2020
- Manuscript Accepted: May 14, 2020
- Published: June 10, 2020

Abstract

The impact of laser conditioning (LC) fluence and pulse duration on nanosecond (ns) laser damage performance of deuterated potassium dihydrogen phosphate (DKDP) crystal is studied. The result shows that higher LC fluence leads to a better damage resistance. In general, the sub-nanosecond LC effect is better than the nanosecond LC. However, in the range of 0.3 ns to 0.8 ns, the pulse duration has no obvious impact on the LC effect. An ultra-fast process characterization technology is employed to demonstrate that the cleaning effect of the protuberance defects on the surface is one of sub-ns LC mechanism. Eventually, a couple of optimized LC parameters that doubled the maximum damage threshold of DKDP crystal is proposed.

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		LC Parameters		Damage Test
Sample Index	Region	Laser Fluence ( $J / {c m}^{2}$ )	Pulse Duration (ns)	Raster Scanning	R-on-1
A	A0	N/A	N/A	$\sqrt$	×
	A1	0.3/1.0/1.7	0.3	$\sqrt$	×
	A2	0.3/1.0/1.7/2.3	0.3	$\sqrt$	×
	A3	0.3/1.0/1.7/1.7/3.0	0.3	$\sqrt$	×
B	B0	N/A	N/A	$\sqrt$	×
	B1	0.3/1.0/1.7	0.5	$\sqrt$	×
	B2	0.3/1.0/1.7/2.3	0.5	$\sqrt$	×
	B3	0.3/1.0/1.7/1.7/3.0	0.5	$\sqrt$	×
C	C0	N/A	N/A	$\sqrt$	×
	C1	0.3/1.0/1.7	0.8	$\sqrt$	×
	C2	0.3/1.0/1.7/2.3	0.8	$\sqrt$	×
	C3	0.3/1.0/1.7/1.7/3.0	0.8	$\sqrt$	×
D	D0	N/A	N/A	$\sqrt$	×
	D1	0.3/1.0/1.7/1.7/3.0	0.3	$\sqrt$	×
	D2	0.3/1.0/1.7/1.7/3.0	0.5	$\sqrt$	×
	D3	0.3/1.0/1.7/1.7/3.0	0.8	$\sqrt$	×
E	E0	N/A	N/A	$\sqrt$	×
	E1	0.3/1.0/1.7/1.7/3.0	0.5	$\sqrt$	×
	E2	0.3/1.0/1.7/1.7/3.0	6.8	$\sqrt$	×
F	F0	N/A	N/A	×	$\sqrt$
	F1	0.3/1.0/1.7/1.7/3.0	0.3	×	$\sqrt$
	F2	0.3/1.0/1.7/1.7/3.0	0.5	×	$\sqrt$
	F3	0.3/1.0/1.7/1.7/3.0	0.8	×	$\sqrt$
	F4	0.3/1.0/1.7/1.7/3.0	6.8	×	$\sqrt$

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