大口径融石英光栅反射衍射的SBS损伤分析
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摘要
为了分析大口径融石英光栅反射衍射导致的受激布里渊散射(SBS)损伤,建立了光栅的设计分析模型,计算了光栅从1到6级次的反射衍射角、焦距及效率;根据SBS原理分析了未施加相位调制和施加相位调制下融石英光栅反射衍射的SBS增益及强度,并结合工程实例验证了该分析结果的可靠性。实验结果表明:在未施加相位调制时,融石英光栅反射衍射的SBS强度大,元件损伤严重,寿命短;施加相位调制后,光栅反射衍射的SBS增益大幅降低,SBS强度小于融石英的损伤阈值,元件寿命得以显著延长。在实际的高功率激光系统中,必须施加相位调制以抑制光栅反射衍射的SBS损伤。
In order to solve the stimulated Brillouin scattering(SBS)damage by reflected diffraction of fused silica grating with large aperture,we establish the design and analysis model of grating,the reflected diffraction angle,focal length and efficiency from 1 to 6 orders reflected diffraction of the grating are calculated.The gain and intensity of SBS with modulated laser and original laser are analyzed based on SBS principle,and the reliability of the analysis is verified by an engineering example.The experimental results show that the SBS intensity is large,the grating element is seriously damaged and its service life is short when the phase modulation is not applied.Moreover,when the phase modulation is applied,the SBS intensity is less than the damage threshold of fused silica and the service life of grating element increases evidently.In the actual high power laser system,phase modulation must be applied to suppress SBS damage of grating reflected diffraction.
In order to solve the stimulated Brillouin scattering(SBS)damage by reflected diffraction of fused silica grating with large aperture,we establish the design and analysis model of grating,the reflected diffraction angle,focal length and efficiency from 1 to 6 orders reflected diffraction of the grating are calculated.The gain and intensity of SBS with modulated laser and original laser are analyzed based on SBS principle,and the reliability of the analysis is verified by an engineering example.The experimental results show that the SBS intensity is large,the grating element is seriously damaged and its service life is short when the phase modulation is not applied.Moreover,when the phase modulation is applied,the SBS intensity is less than the damage threshold of fused silica and the service life of grating element increases evidently.In the actual high power laser system,phase modulation must be applied to suppress SBS damage of grating reflected diffraction.
引文
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[3]van Wonterghem B M,Burkhart S C,Spaeth M L.National Ignition Facility commissioning and performance[C].SPIE,2004,5341:55-65.
[4]Zhou H X,Cheng Y F.Holographic optics[M].Beijing:Chemical Industry Press,2006:16-68.周海宪,程云芳.全息光学[M].北京:化学工业出版社,2006:16-68.
[5]Bude J,Miller P,Baxamusa S,et al.High fluence laser damage precursors and their mitigation in fused silica[J].Optics Express,2014,22(5):5839-5851.
[6]Eggleston J M,Kushner M J.Stimulated Brillouin scattering parasitics in large optical windows[J].Optics Letters,1987,12(6):410-412.
[7]Yang A H,Liu D A,Gao Y R,et al.Propagation and prejudgement technique of hot images in high power laser system[J].Chinese Journal of Lasers,2017,44(9):0901006.杨爱华,刘德安,高雅茹,等.高功率激光系统中热像的传输及预判技术[J].中国激光,2017,44(9):0901006.
[8]Thompson C E,Kyrazis D T,Murray J R,et al.Experimental observation and suppression of transverse stimulated Brillouin scattering in large optical components[J].Journal of the Optical Society of America B,1989,6(12):2402-2410.
[9]Tang S X,Ouyang X P,Zhu B Q,et al.Research on high-power laser induced damage of large aperture fused silica[J].Acta Optica Sinica,2009,29(3):756-760.唐顺兴,欧阳小平,朱宝强,等.高功率激光对大口径融石英玻璃的破坏的研究[J].光学学报,2009,29(3):756-760.
[10]You K W,Zhang Y L,Zhang X J,et al.Analysis of near-field modulations caused by defects in high power laser system[J].Chinese Journal of Lasers,2017,43(3):0302002.尤科伟,张艳丽,张雪洁,等.高功率激光系统中缺陷引起的近场调制分析[J].中国激光,2017,43(3):0302002.
[11]Hao Y F,Sun M Y,Shi S,et al.Research on rear surface damage in picosecond laser ablation of K9glass[J].Chinese Journal of Lasers,2017,44(1):0102015.郝艳飞,孙明营,时双,等.皮秒激光烧蚀K9玻璃后表面损伤研究[J].中国激光,2017,44(1):0102015.
[12]Haynam C A,Wegner P J,Auerbach J M,et al.The National Ignition Facility laser performance status[J].Applied Optics,2007,46(16):3276-3303.
[13]Wang J,Zhang X M,Han W,et al.Experimental observation of near-field deterioration induced by stimulated rotational Raman scattering in long air path[J].Chinese Physics Letters,2011,28(8):084211.
[14]Smith A V,Do B T.Bulk and surface laser damage of silica by picosecond and nanosecond pulses at1064nm[J].Applied Optics,2008,47(26):4812-4832.
[15]Mose E I.Ignition on the National Ignition Facility:a path towards inertial fusion energy[J].Nuclear Fusion,2009,49(10):486-496.