1064nm激光和355nm激光同时辐照DKDP晶体的耦合预处理效应
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摘要
为了研究DKDP晶体在惯性约束核聚变(ICF)装置应用中的多波长激光诱导损伤特性,建立了1064 nm激光和355 nm激光同时辐照DKDP晶体的损伤测试装置,分析了不同激光能量密度组合下的损伤针点形貌、密度、尺寸和损伤概率。结果表明,当355 nm激光以R-on-1方式辐照样品,并加入不同能量密度的1064 nm激光时,随着1064 nm激光能量密度的升高,测试样品的抗激光损伤性能得到改善,损伤针点形貌逐渐与1064 nm激光单独作用时的损伤形貌类似,损伤针点密度减小,损伤针点尺寸增大,整体上表现出耦合预处理效应。
To study the characteristics of multi-wavelength laser-induced damages in DKDP crystals used in the inertial confinement fusion(ICF) device, a damage test facility is established, in which the DKDP crystals are under the simultaneous irradiation of 1064 nm and 355 nm lasers. The damage pinpoint morphology, density, size, and damage probability under exposure by a combination of different laser fluences are compared and analyzed. When irradiating a sample with 355-nm laser pulses in R-on-1 tests, 1064-nm laser pulses with different fluences are added. The results show that as the 1064-nm laser fluence increases, the laser damage resistance of the sample increases, the damage pinpoint morphology tends to be similar with that when the sample is irradiated by the 1064 nm laser alone, the damage pinpoint density decreases, and the damage pinpoint size increases. As a whole, the coupling conditioning effect is clearly exhibited.
To study the characteristics of multi-wavelength laser-induced damages in DKDP crystals used in the inertial confinement fusion(ICF) device, a damage test facility is established, in which the DKDP crystals are under the simultaneous irradiation of 1064 nm and 355 nm lasers. The damage pinpoint morphology, density, size, and damage probability under exposure by a combination of different laser fluences are compared and analyzed. When irradiating a sample with 355-nm laser pulses in R-on-1 tests, 1064-nm laser pulses with different fluences are added. The results show that as the 1064-nm laser fluence increases, the laser damage resistance of the sample increases, the damage pinpoint morphology tends to be similar with that when the sample is irradiated by the 1064 nm laser alone, the damage pinpoint density decreases, and the damage pinpoint size increases. As a whole, the coupling conditioning effect is clearly exhibited.
引文
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[20] Zhou M,Zhao Y A,Li D W,et al.Laser damage of optical film with the combined irradiation of 1064 nm and 532 nm pulse[J].Chinese Journal of Lasers,2009,36(11):3050-3054.周明,赵元安,李大伟,等.1064 nm和532 nm激光共同辐照薄膜的损伤[J].中国激光,2009,36(11):3050-3054.
[21] Wang Y,Zhao Y,Xie X,et al.Laser damage dependence on the size and concentration of precursor defects in KDP crystals:view through differently sized filter pores[J].Optics Letters,2016,41(7):1534-1537.
[22] Negres R A.Differentiation of defect populations responsible for bulk laser-induced damage in potassium dihydrogen phosphate crystals[J].Optical Engineering,2006,45(10):104205.
[2] Manes K R,Spaeth M L,Adams J J,et al.Damage mechanisms avoided or managed for NIF large optics[J].Fusion Science and Technology,2016,69(1):146-249.
[3] Xie X Y,Zhu M D,Wang B,et al.Performance of rapidly grown KDP crystals irradiated by gamma ray[J].Chinese Journal of Lasers,2018,45(10):1003004.谢晓义,朱茂东,王斌,等.γ射线辐照快速生长KDP晶体的性能[J].中国激光,2018,45(10):1003004.
[4] Wang S F,Xu Q,Wang J,et al.Methods for surface defect suppression in fly-cutting fabrication of KDP crystals[J].Acta Optica Sinica,2018,38(11):1116001.汪圣飞,许乔,王健,等.KDP晶体飞切加工表面缺陷的抑制方法[J].光学学报,2018,38(11):1116001.
[5] Ran Y T,Huang H B,Yin J,et al.Study on defect depth of surface of KDP crystals fabricated by single point diamond turning[J].Acta Photonica Sinica,2017,46(5):0524001.冉钰庭,黄宏彪,尹进,等.单点金刚石飞切KDP晶体表面缺陷深度的研究[J].光子学报,2017,46(5):0524001.
[6] Reyné S,Duchateau G,Natoli J Y,et al.Laser-induced damage of KDP crystals by 1ω nanosecond pulses:influence of crystal orientation[J].Optics Express,2009,17(24):21652-21665.
[7] DeMange P,Negres R A,Rubenchik A M,et al.The energy coupling efficiency of multiwavelength laser pulses to damage initiating defects in deuterated KH2PO4 nonlinear crystals[J].Journal of Applied Physics,2008,103(8):083122.
[8] DeMange P,Negres R A,Rubenchik A M,et al.Understanding and predicting the damage performance of KDxH2-xPO4 crystals under simultaneous exposure to 532- and 355-nm pulses[J].Applied Physics Letters,2006,89(18):181922.
[9] Reyné S,Loiseau M,Duchateau G,et al.Toward a better understanding of multi-wavelength effects on KDP crystals[J].Proceedings of SPIE,2009,7361:73610Z.
[10] Carr C W,Auerbach J M.Effect of multiple wavelengths on laser-induced damage in KH2-xDxPO4 crystals[J].Optics Letters,2006.31(5):595-597.
[11] Reyné S,Duchateau G,Natoli J Y,et al.Pump-pump experiment in KH2PO4 crystals:coupling two different wavelengths to identify the laser-induced damage mechanisms in the nanosecond regime[J].Applied Physics Letters,2010,96(12):121102.
[12] Exarhos G J,Adams J J,Guenther A H,et al.Wavelength and pulselength dependence of laser conditioning and bulk damage in doubler-cut KH2PO4[J].Proceedings of SPIE,2005,5991:59911R.
[13] Adams J J,Jarboe J A,Carr C W,et al.Results of sub-nanosecond laser-conditioning of KD2PO4 crystals[J].Proceedings of SPIE,2006,6403:64031M.
[14] Exarhos G J,Adams J J,Guenther A H,et al.Pulse length dependence of laser conditioning and bulk damage in KD2PO4[J].Proceedings of SPIE,2004,5647:265-278.
[15] Hu G H,Zhao Y A,Sun S T,et al.One-on-one and R-on-one tests on KDP and DKDP crystals with different orientations[J].Chinese Physics Letters,2009,26(8):087801.
[16] Krol H,Gallais L,Grèzes-Besset C,et al.Investigation of nanoprecursors threshold distribution in laser-damage testing[J].Optics Communications,2005,256(1/2/3):184-189.
[17] Hu G H,Zhao Y A,Li D W,et al.Wavelength dependence of laser-induced bulk damage morphology in KDP crystal:determination of the damage formation mechanism[J].Chinese Physics Letters,2012,29(3):037801.
[18] Reyné S,Duchateau G,Hallo L,et al.Multi-wavelength study of nanosecond laser-induced bulk damage morphology in KDP crystals[J].Applied Physics A,2015,119(4):1317-1326.
[19] Feit M D,Rubenchik A M.Implications of nanoabsorber initiators for damage probability curves,pulselength scaling,and laser conditioning[J].Proceedings of SPIE,2004,5273:74-83.
[20] Zhou M,Zhao Y A,Li D W,et al.Laser damage of optical film with the combined irradiation of 1064 nm and 532 nm pulse[J].Chinese Journal of Lasers,2009,36(11):3050-3054.周明,赵元安,李大伟,等.1064 nm和532 nm激光共同辐照薄膜的损伤[J].中国激光,2009,36(11):3050-3054.
[21] Wang Y,Zhao Y,Xie X,et al.Laser damage dependence on the size and concentration of precursor defects in KDP crystals:view through differently sized filter pores[J].Optics Letters,2016,41(7):1534-1537.
[22] Negres R A.Differentiation of defect populations responsible for bulk laser-induced damage in potassium dihydrogen phosphate crystals[J].Optical Engineering,2006,45(10):104205.
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