Research on pulsed laser damaged of TGG crystals
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摘要: 通过泵浦探测超快成像技术，采用固体激光器输出的
1064 nm激光对铽镓石榴石（TGG）磁光元件的入射面、出射面进行了辐照损伤测试，研究了铽镓石榴石晶体镀膜元件在基频1064 nm脉冲激光辐照下的损伤特性及损伤后的动力学特性。结果表明，镀膜元件在出射面表现出较低的损伤阈值，而入射面和出射面损伤差异主要受激光诱导的等离子体效应影响。通过超快阴影成像研究发现，铽镓石榴石晶体入射面初始损伤主要来源于膜层杂质缺陷，在高能下会发生膜层的剥离；出射面损伤主要以基底材料中的杂质缺陷诱导损伤为主，损伤坑的尺寸随着激光能量的增加而逐渐增大。Abstract: This article mainly investigated on the incident and exit surfaces of terbium gallium garnet (TGG) magneto-optical elementsby damaged by the laser with wavelength of1064 nm through pump-probe imaging technology. The damage characteristics of terbium gallium garnet elements under fundamental1064 nm pulse laser irradiation are studied. The results indicated that the coated TGG element exhibits a lower damage threshold at the incident surface compared with the exit surface, and the difference in damage morphology between the entrance and exit surface was mainly influenced by laser-induced plasma effects. It was found that the initial damage on the TGG incident surface gmainly came from impurities and defects in the coatings, and the separation of the film layer under high energy would be happened; The exit surface damage of coated TGG components was mainly induced by impurity defects in the substrate material, and the size of damage pits was increased gradually under higher laser energy. By analyzing the influence of factors such as laser pulse energy, plasma effect, and material damage response on the laser damage threshold, it provided important and significant reference for improving the anti-damage ability of TGG magneto-optical materials under high-power laser irradiation.-
Key words:
- terbium gallium garnet /
- laser damage /
- damage threshold /
- ultrafast imaging
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图 1 磁光元件损伤测试光路系统示意图
Figure 1. Schematic diagram of the optical path system for testing the damage of magneto-optical components
图 3 TGG镀膜元件在
1064 nm激光辐照下入射面及出射面的损伤概率曲线Figure 3. The damage curves of the incident and exit plane of TGG coated components under
1064 nm laser irradiation
图 4
1064 nm激光在膜层入射面诱导损伤光学显微图Figure 4. Optical microscope image of
1064 nm laser-induced damage on the incident plane of the film layer
图 5
1064 nm激光在膜层出射面诱导损伤光学显微图Figure 5. Optical microscope image of
1064 nm laser-induced damage on the exit plane of the film layer
图 6 TGG镀膜元件入射面损伤轮廓形貌
Figure 6. The damage profile morphologies of the incident plane of the TGG coated
图 7 TGG镀膜元件入射面损伤轮廓形貌
Figure 7. The damage profile morphologies of the exit plane of the TGG coated
图 8 在
1064 nm激光辐照下TGG镀膜元件入射面的时间阴影超快成像结果Figure 8. The Ultra-fast imaging of temporal shadows test result of the incident plane of TGG coated components under
1064 nm laser irradiation
图 9 在
1064 nm激光辐照下TGG晶体出射面的时间阴影超快成像结果Figure 9. The Ultra-fast imaging of temporal shadows test result of the exit plane of TGG coated components under
1064 nm laser irradiation -
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