Application of image processing in dual-wavelength laser-induced damage growth of fused silica
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摘要: 利用图像处理方法对比研究了单波长辐照和双波长激光同时辐照下熔石英光学元件的损伤增长阈值。通过实时采集损伤图像和靶面光斑能量空间分布，获取损伤增长发生位置对应的能量密度。针对
$3\omega $ 单独辐照、$3\omega $ 和$1\omega $ 同时辐照下熔石英元件损伤增长的实验数据，比较分析了基于图像处理方法和传统损伤增长阈值R-on-1测量方法（国标）所得结果的差异。结果表明：本文采用的图像处理方法在研究小口径非均匀光斑辐照下的熔石英光学元件损伤增长阈值时，能解决传统损伤阈值测试中将能量密度分布非均匀光斑等效为均匀分布的平顶光斑带来的计算误差问题，有助于降低损伤（增长）阈值测量中的光斑口径效应。-
关键词:
- 激光诱导损伤增长阈值 /
- 熔石英 /
- 双波长 /
- 小口径非均匀光斑 /
- 图像处理
Abstract: The damage growth threshold of fused silica optical elements under single-wavelength irradiation and dual-wavelength laser irradiation was studied based on image processing methods. Through real-time acquisition of the damage image and the spot spatial energy distribution, the energy density at the location where the damage growth occurs was obtained. Aiming at the experimental data of the damage growth of fused silica optical elements under$3\omega $ irradiation,$3\omega $ and$1\omega $ simultaneous irradiation, the differences between the results obtained by the image processing method and the traditional damage growth threshold R-on-1 measurement method (GB) were compared and analyzed. The results show that the image processing method used in this paper can solve the calculation error problems caused by the traditional method that the non-uniform spot with energy density distribution is equivalent to the flat top spot with uniform distribution when the damage of fused silica optical element increases under the non-uniform spot of small aperture irradiation, and reduce the effect of light spot caliber in damage (growth) threshold measurement. -
图 1 双波长辐照光学元件损伤（增长）测试实验装置
Figure 1. Experimental device for damage (growth) testing of dual-wavelength irradiated optical elements
图 2 获取靶面辐照区能量密度分布的流程
Figure 2. Process of obtaining the energy density distribution in the irradiation area of the target surface
图 3
$3\omega $ 单独辐照下熔石英后表面损伤增长的典型结果Figure 3. Typical results of surface damage growth of fused silica irradiated by
$3\omega $ lasers
图 4
$3\omega $ 和$1\omega $ 同时辐照下熔石英后表面损伤增长的典型结果Figure 4. Typical results of surface damage growth of fused silica under simultaneous irradiation of
$3\omega $ and$1\omega $ lasers表 1
$3\omega $ 激光单独辐照下损伤增长阈值的测试实验Table 1. Testing experiments of damage growth threshold irradiated by
$3\omega $ lasersNo. amage growth threshold/（J/cm2） image processing traditional method 1 9.18 5.17 2 12.39 9.59 3 9.25 5.56 4 8.70 5.17 5 10.98 6.60 6 11.87 8.64 7 14.19 8.19 8 12.44 7.54 9 9.76 6.50 10 8.89 5.17 
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表 2
$3\omega $ 和$1\omega $ 同时辐照且平均能量密度比为5:1的损伤增长阈值Table 2. Damage growth thresholds under simultaneous irradiation of
$3\omega $ and$1\omega $ lasers with an average energy density ratio of 5:1No. damage growth treshold/(J/cm2） 3ω 1ω image processing traditional method image processing traditional method 1 6.51 4.79 2.07 0.93 2 8.76 4.73 2.44 0.96 3 8.79 4.82 2.47 0.95 4 7.44 4.76 2.10 0.95 5 10.58 7.93 4.03 1.58 6 11.65 6.44 2.87 1.27 7 10.90 7.87 3.85 1.58 8 12.26 7.84 3.00 1.58 9 11.35 6.44 3.17 1.27 10 9.88 6.28 3.30 1.28
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表 3
$3\omega $ 和$1\omega $ 同时辐照且平均能量密度比为5:5的损伤增长阈值Table 3. Damage growth thresholds under simultaneous irradiation of
$3\omega $ and$1\omega $ lasers with an average energy density ratio of 5:5No. damage growth treshold(J/cm2） 3ω 1ω image processing traditional method image processing traditional method 1 8.17 4.76 12.99 4.91 2 5.82 4.00 10.28 4.11 3 7.40 4.00 10.55 4.11 4 9.10 4.92 12.42 5.06 5 12.02 6.19 14.42 6.28 6 10.01 6.34 14.56 6.28 7 10.42 6.15 15.14 6.37 8 8.64 4.79 13.17 4.94 9 7.98 4.79 10.69 4.94 10 11.74 6.34 15.70 6.40
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