Effect of 355 nm and 1064 nm dual-wavelength conditioning on the bulk damage properties of DKDP crystal
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摘要: 为了研究3ω预处理、3ω和1ω同时辐照预处理情况后DKDP晶体的3ω损伤特性，建立了双波长预处理和损伤测试实验系统，重点研究了双波长同时辐照预处理情况下1ω能量密度对预处理效果的影响，分析了双波长同时辐照预处理过程中的能量耦合机制。研究结果表明：双波长同时辐照预处理在提升DKDP晶体抗3ω激光损伤性能方面的效果明显好于单波长预处理；在双波长同时辐照预处理情况下，远低于自身预处理阈值的1ω参与了预处理作用过程；在相同3ω能量密度、能量阶梯的预处理策略下，1ω能量密度存在最佳值。Abstract: To study the 3ω damage characteristics of DKDP crystals after 3ω conditioning, 3ω and 1ω conditioning at the same time, a dual-wavelength conditioning and damage test experimental system was established. The conditioning effects of 1ω energy density under dual wavelength irradiation were studied emphatically. The energy coupling mechanism in the conditioning process of dual-wavelength irradiation was analyzed. Research results show that the effect of dual-wavelength conditioning is significantly better than that of single wavelength. In the case of dual-wavelength simultaneous irradiation conditioning, the 1ω which is far below the threshold value of its own conditioning participates in the conditioning. Under the same conditioning strategy of 3ω energy density and energy gradient, there is an optimal value of 1ω energy density.
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图 1 双波长预处理和损伤测试实验系统图
Figure 1. Experimental system diagram of dual-wavelength conditioning and damage test
图 3 不同能量密度组合的双波长预处理对DKDP晶体3ω损伤概率的影响
Figure 3. The effect of dual-wavelength conditioning with different energy density combinations on the 3ω damage probability of DKDP crystal
图 4 不同预处理条件下的典型体损伤点形貌
Figure 4. Typical bulk damage pinpoint morphologies under different laser conditioning
表 1 双波长预处理参数
Table 1. Dual-wavelength conditioning parameters
group A fluence/(J·cm−2) group B fluence/(J·cm−2) 1ω 3ω 1ω 3ω A1 0 7.4, 9.2, 11.0, 12.8, 14.6 B1 0 7.4, 9.2, 11.0 A2 2.6 7.4, 9.2, 11.0, 12.8, 14.6 B2 7.9 7.4, 9.2, 11.0 A3 5.3 7.4, 9.2, 11.0, 12.8, 14.6 B3 10.6 7.4, 9.2, 11.0 A4 7.9 7.4, 9.2, 11.0, 12.8, 14.6 B4 15.9 7.4, 9.2, 11.0 A5 10.6 7.4, 9.2, 11.0, 12.8, 14.6 — — — 
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表 2 不同预处理方式下3ω的最大零概率损伤阈值和平均损伤点密度
Table 2. Maximum zero probability damage threshold and average damage pinpoints density of 3ω under different pre-exposure methods
group area initial bulk damage
threshold/(J·cm−2)percentage/% mean pinpoints density/mm3
(3ω, about 33.6 J/cm2)without conditioning — 13.7 0 25 A A1 16.6 21.2 10 A2 18.2 32.8 8 A3 18.8 37.2 4 A4 19.9 45.3 1 B B1 16.3 19.1 18 B2 19.3 40.9 4 B3 18.3 33.6 5 B4 17.5 27.7 11
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表 3 预处理参数与b的关系表
Table 3. Relationship between conditioning parameters and b
area conditioning methods 1ω energy density/(J·cm−2) b without pre-exposure — −13.752 A A1 3ω 0 −16.664 A2 3ω+1ω 2.6 −18.062 A3 5.3 −18.934 A4 7.9 −19.844 B B1 3ω 0 −16.001 B2 3ω+1ω 7.9 −19.140 B3 10.6 −18.196 B4 15.9 −17.291
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