Irradiation damage distribution characteristics of DKDP in large-aperture high-energy laser
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摘要: 大口径高能激光装置是各强国积极研究的重点项目。对装置内大口径光学元件损伤特性进行有效评估具有非常重要的意义，在此研究大尺寸光学元件表面损伤。通过分段拍摄、图像拼合、损伤点记录、统计与归纳等工作发现，不同尺寸损伤点的分布特性差异较大。结合统计学方法与类似实验对比、理论计算等方式对损伤点分布与样品辐照环境特性变化的关系进行分析。结果显示，损伤点的位置分布与辐照光束的能量密度关联紧密；系统光束(351 nm)在低于6 J/cm2时能量分布均匀，高于6.7 J/cm2时呈现较为明显的高斯分布状态。可以为大口径高能辐照环境的元件损伤特性评估提供有价值的参考，对大口径紫外激光器的日常运行与维护具有极其重要的工程意义。Abstract: To establish the effective evaluation about damage properties of large-aperture and high-energy optic components, we studied the statistics of the surface damage of the DKDP component. We analysed and summarized various kinds of damage distributing in surface of the optic component by step-by-step shooting, merging images and counting damage pits. We investigated correlation distribution of damage types and irradiation conditions using statistics of surface damage data, theoretical calculation and demonstration of similar experiment. It is found that positions of damage pits are closely relevant to distribution of energy density of laser beam (3ω). When the energy density exceeds 6.7 J/cm2, the distribution of energy density of the laser beam can be Gaussian. On the contrary, when energy density is less than 6.7 J/cm2, the distribution of energy density of the laser beam can be uniform. Our study could provide a valuable reference for evaluating characteristics of damage to optical component working under irradiation in large-aperture high-energy laser. It is also reterable in operating and maintaining large-aperture high-energy laser facility.
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Key words:
- DKDP /
- laser induced damage /
- distribution /
- large-aperture /
- high-energy laser
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图 4 50 μm＜D＜100 μm损伤点的损伤位置分布图
Figure 4. Count of craters of different diameter (50 μm＜D＜100 μm)
图 5 50 μm＜D＜100 μm的损伤点数量分布图
Figure 5. Count of craters of different diameter (50 μm＜D＜100 μm)
图 7 100 μm＜D＜1000 μm损伤点的损伤位置分布图
Figure 7. Distribution region of craters(100 μm＜D＜1000 μm)
图 8 100 μm＜D＜1000 μm损伤点的数量分布图
Figure 8. Count of craters of different diameter (100 μm＜D＜1000 μm)
表 1 不同类型损伤统计结果（DKDP）
Table 1. Statistical result of different types of damages (DKDP)
diameter of crater D/μm count of craters quantitative proportion/% area of damage/mm2 area proportion/% ＜50 26 0.70 0.04 ≈0.000 02 50～100 617 16.58 3.20 ＜0.002 100～1 000 2675 71.89 221.76 0.001 2 ＞1 000 403 10.83 8335.01 0.045 1 total 3721 8560.01 0.046 3 
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表 2 损伤统计结果(KDP)
Table 2. Statistical result of damages result (KDP)
diameter of crater/μm count of craters quantitative proportion/% ＜10 4087 48.16 10～20 1736 20.45 20～30 955 11.25 30～40 830 9.78 40～50 523 6.16 ＞50 356 4.19 total 8487
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表 3 对比损伤统计结果（DKDP）
Table 3. Contrast statistics of result(DKDP)
diameter of crater/μm count of craters quantitative proportion/% ＜5 0（out of resolution） 0.00 5～10 0 0.00 10～20 5 0.13 20～30 16 0.43 30～40 3 0.08 40～50 2 0.05 ＞50 3695 99.30 total 3721
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