| Effect of λ/2 SiO_2 overcoat on the laser damage of HfO_2/SiO_2 high-reflector coatings |
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| 引用本文： | 胡建平,马平,许乔,李伟.Effect of λ/2 SiO_2 overcoat on the laser damage of HfO_2/SiO_2 high-reflector coatings[J].Chinese Optics Letters,2003,1(6). |
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| 作者姓名： | 胡建平 马平 许乔 李伟 |
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| 作者单位： | Chengdu Fine Optics Engineering Research Center，P. O. Box 450，Chengdu 610041，Chengdu Fine Optics Engineering Research Center，P. O. Box 450，Chengdu 610041，Chengdu Fine Optics Engineering Research Center，P. O. Box 450，Chengdu 610041，Chengdu Fine Optics Engineering Research Center，P. O. Box 450，Chengdu 610041 |
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| 摘 要： | The effect of λ/2 SiO2 overcoat on the laser damage characteristics of HfO2/SiO2 high-reflector (HR) coatings is investigated with 1-on-l and N-on-1 laser damage test methods. The laser damage surface of 1-on-l is analyzed by a step analyzer. The surface morphologies show that laser damage makes the coating damaged area protrudent and rough for HR coating without λ/2 silica overcoat, but concave and smooth for HR coating with A/2 silica overcoat. The result of 10-on-l multi-pulse irradiation on the same point of the coating shows that there is an energy density stage on the damage curve. If the laser energy density is within the range of the stage, HfO2/SiO2 HR coatings with λ/2 silica overcoat will not be damaged more than 2 times for multi-shots, and the surface damages are very slight so that there is no impact on the coating performance. Another interesting result is that the energy density stage extends from the damage threshold to the point of about 3 times of threshold, which is similar to the
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Effect of γ/2 SiO2 overcoat on the laser damage of HfO2/SiO2 high-reflector coatings |
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| Abstract: | The effect of λ/2 SiO2 overcoat on the laser damage characteristics of HfO2/SiO2 high-reflector (HR)coatings is investigated with 1-on-1 and N-on-1 laser damage test methods. The laser damage surface of 1-on-1 is analyzed by a step analyzer. The surface morphologies show that laser damage makes the coating damaged area protrudent and rough for HR coating without λ/2 silica overcoat, but concave and smooth for HR coating with λ/2 silica overcoat. The result of 10-on-1 multi-pulse irradiation on the same point of the coating shows that there is an energy density stage on the damage curve. If the laser energy density is within the range of the stage, HfO2/SiO2 HR coatings with λ/2 silica overcoat will not be damaged more than 2 times for multi-shots, and the surface damages are very slight so that there is no impact on the coating performance. Another interesting result is that the energy density stage extends from the damage threshold to the point of about 3 times of threshold, which is similar to the effect of the laser condition on coating. |
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