960线光谱合束光栅的热畸变分析 
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Thermal Distortion of 960-Line Spectral Beam Combining Grating
1 中国科学院上海光学精密机械研究所高能激光材料重点实验室, 上海 201800
2 中国科学院大学, 北京 100049
图 & 表
图 1. 合束光栅热畸变实验装置
Fig. 1. Experimental device for thermal distortion of spectral beam combining grating
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图 2. (a)合束光栅表面的最高温度随辐照功率密度的变化;(b) Hmax和M2随辐照功率密度的变化
Fig. 2. (a) Variation of maximum temperature of spectral beam combining grating surface with irradiation power density; (b) variations of Hmax and M2 with irradiation power density
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图 3. (a)~(c)建模的中间过程;(d)简化后的模拟光路图
Fig. 3. (a)-(c) The middle processes of model building; (d) the simulated light path diagram after simplification
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图 4. (a)不同辐照功率密度下合束光栅表面的畸变;(b)~(e)不同辐照功率密度下远场光斑的强度分布
Fig. 4. (a) Distortion of spectral beam combing grating surface at different irradiation power densities; (b)-(e) the intensity distributions of far-field beam spots at different irradiation power densities
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图 5. (a)合束光栅表面最高温度随基底厚度的变化;(b)不同基底厚度合束光栅的热畸变
Fig. 5. (a) Variation of maximum temperature of spectral beam combing grating with the thickness of substrate; (b) thermal distortion of spectral beam combing grating with different substrate thicknesses
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表 1石英基底的热力学参数
Table1. Thermodynamic parameters of silica substrate
| Parameter | Value |
|---|
| Density /(kg·m-3) | 2200 | | Refractive index | 1.44 | | Heat capacity /(J·kg-1·K-1) | 670 | | Thermal conductivity /(W·m-1·K-1) | 1.4 | | Thermal expansion /(10-6 K-1) | 0.55 | | Young’s modulus /GPa | 72 | | Poisson ratio | 0.17 |
|
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表 2不同辐照功率密度下合束光栅表面的最高温度、最大热畸变量以及远场光束的质量
Table2. Maximum temperature, maximum thermal distortion and far-field beam quality of spectral beam combining grating at different irradiation power densities
| Irradiation power density /(kW·cm-2) | 0.08 | 2.00 | 3.60 | 10.00 |
|---|
| Maximum temperature /℃ | 20 | 118 | 200 | 528 | | /nm | 4 | 76 | 136 | 372 | | 1.04 | 1.29 | 1.58 | 3.17 | | 1.00 | 1.01 | 1.04 | 1.83 |
|
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表 3不同基底厚度的合束光栅在相同功率密度激光辐照下的远场光束质量
Table3. Far-field beam quality of spectral beam combing grating with different substrate thicknesses at laser irradiation with same power density
| Thickness /mm | 1 | 2 | 3 | 4 | 5 |
|---|
| 1.60 | 1.55 | 1.50 | 1.45 | 1.39 | | 1.04 | 1.04 | 1.04 | 1.03 | 1.03 |
|
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徐姣, 陈俊明, 陈鹏, 王勇禄, 张益彬, 孔钒宇, 晋云霞, 邵建达. 960线光谱合束光栅的热畸变分析[J]. 光学学报, 2018, 38(5): 0505002. Jiao Xu, Junming Chen, Peng Chen, Yonglu Wang, Yibin Zhang, Fanyu Kong, Yunxia Jin, Jianda Shao. Thermal Distortion of 960-Line Spectral Beam Combining Grating[J]. Acta Optica Sinica, 2018, 38(5): 0505002.
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