Rapid growth of a large-scale (600 mm aperture) KDP crystal and its optical quality

Guohui Li; Guozong Zheng; Yingkun Qi; Peixiu Yin; En Tang; Fei Li; Jing Xu; Taiming Lei; Xiuqin Lin; Min Zhang; Junye Lu; Jinbo Ma; Youping He; and Yuangen Yao

doi:10.1017/hpl.2014.3

High Power Laser Science and Engineering, Volume. 2, Issue 1, 010000e2(2014)

Rapid growth of a large-scale (600 mm aperture) KDP crystal and its optical quality

Guohui Li^*, Guozong Zheng, Yingkun Qi, Peixiu Yin, En Tang, Fei Li, Jing Xu, Taiming Lei, Xiuqin Lin, Min Zhang, Junye Lu, Jinbo Ma, Youping He, and and Yuangen Yao

Author Affiliations

Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China

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Figures & Tables(8)

Fig. 1. 2000 L crystallizer. 1-stainless steel crystallizer; 2-vessel cover; 3-thermostat; 4-rotational motor; 5-heater; 6-stirrer; 7-aluminum platform; 8-point seed.

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$The grown KDP crystals with sizes of (a) 680 $\times $ 580 $\times $ 540 mm$^{3}$ (growth period: 150 days) and (b) 650 $\times $ 550 $\times $ 540 mm$^{3}$ (growth period: 140 days) (b).$

Fig. 2. The grown KDP crystals with sizes of (a) 680 $\times $ 580 $\times $ 540 mm$^{3}$ (growth period: 150 days) and (b) 650 $\times $ 550 $\times $ 540 mm$^{3}$ (growth period: 140 days) (b).

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Fig. 3. Transmission spectra of KDP crystals.

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$Measured $\Delta $($n_{\mathrm{e}}$–$n_{\mathrm{o}}$) distribution for the rapid-growth KDP doubler.$

Fig. 4. Measured $\Delta $($n_{\mathrm{e}}$–$n_{\mathrm{o}}$) distribution for the rapid-growth KDP doubler.

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Table 1. Laser damage thresholds of $Z$-cut KDP crystals.
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Table 1. Laser damage thresholds of $Z$-cut KDP crystals.
Sample Sector R-on-1 (J/cm$^{{2}}$, 10 ns) LDT(Scale to 3 ns)
KDP-1 prismatic 25.4 15.1
KDP-2 22.0 13.1
KDP-1 pyramidal 19.5 11.6
KDP-2 19.3 11.5

Table 2. The comparison of refractive-index nonuniformities.

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Table 2. The comparison of refractive-index nonuniformities.

Sample	Size	Refractive-index
		nonuniformities RMS
		($\times $10$^{{-6}})$
KDP-1 (doubler-cut)	330 $\times $ 330 mm	0.843
KDP-2 (doubler-cut)	430 $\times $ 430 mm	0.572
KDP-3 (doubler-cut)	430 $\times $ 430 mm	0.727

Table 3. The comparison of refractive-index nonuniformities.

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Table 3. The comparison of refractive-index nonuniformities.

Sample	Size	RMS ($\times $10$^{{-6}})$	RMS ($\times $10$^{{-6}})$
		(before annealing)	(after annealing)
KDP doubler-1(rapid growth)	330 $\times $ 330 mm	0.843	0.824
KDP doubler-2(rapid growth)	430 $\times $ 430 mm	0.572	0.699
KDP doubler-3(rapid growth)	430 $\times $ 430 mm	0.727	0.763
KDP doubler-4(rapid growth)	45 $\times $ 45 mm	0.771	1.23
KDP doubler-5(slow growth)	45 $\times $ 45 mm	1.02	1.13
KDP tripler-1(slow growth)	45 $\times $ 45 mm	0.469	0.736

Table 4. The comparison of damage threshold.
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Table 4. The comparison of damage threshold.
Sample Wavelength Pulse width R-on-1 (J/cm$^{{2}})$
KDP(before annealing) 1064 nm 10 ns 20.2
KDP(after annealing) 1064 nm 10 ns 27.7

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Guohui Li, Guozong Zheng, Yingkun Qi, Peixiu Yin, En Tang, Fei Li, Jing Xu, Taiming Lei, Xiuqin Lin, Min Zhang, Junye Lu, Jinbo Ma, Youping He, and Yuangen Yao. Rapid growth of a large-scale (600 mm aperture) KDP crystal and its optical quality[J]. High Power Laser Science and Engineering, 2014, 2(1): 010000e2

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