摘要
根据正交偏振干涉测量法(OPI)获得的KDP晶体折射率的空间分布数据求解KDP晶体内部失谐角分布,进而建立了倍频及和频KDP晶体全口径最佳入射角的优化模型和方法。分析讨论了不同折射率畸变程度和不同功率密度入射情况下倍频及和频晶体入射角的变化规律。在此基础上,对KDP晶体的全口径最佳入射角进行了优化。结果表明:当KDP晶体折射率畸变程度较大时,倍频晶体对折射率变化较为敏感,而和频晶体对折射率变化则相对不敏感。在实际工作中,首先在假设倍频晶体折射率分布均匀的前提下,对和频晶体的最佳入射角进行优化,而后通过适当调整倍频晶体及和频晶体的入射角,最终确定倍频晶体及和频晶体的全口径最佳入射角。
According to the spatial distribution data of the refractive index of KDP crystals obtained with orthogonal polarization interferometry（OPI）,the internal detuning angle distributions have been calculated.Consequently,the optimization model and method of the best input angle of full aperture for doubler and tripler KDP crystals have been established.The variations of the input angle of doubler and tripler KDP crystals with different initial intensity of fundamental field have been analyzed and discussed.On this basis,the best input angles of the full aperture for measured KDP crystals have been optimized.The results show that doubler is sensitive to non-uniformity of refractive index while tripler is not for the relatively large values of RMS of internal detuning angle.Consequently,the method for determining the best input angle of the full aperture for doubler and tripler KDP crystals can be optimized.In practical applications,we optimize the best input angle of actually measured tripler assuming the refractive index of doubler is uniform at first.After that,the best input angle of actually measured doubler and tripler could be obtained through appropriately adjusting the input angles of doubler and tripler,respectively.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2014年第7期54-59,共6页
High Power Laser and Particle Beams
基金
四川省教育厅创新团队计划项目(13Td0048)
四川大学优秀青年学者计划项目(2011-2-B17)
关键词
惯性约束聚变
KDP晶体
折射率不均匀性
全口径最佳入射角
转换效率
inertial confinement fusion
KDP crystals
non-uniformity of refractive index
best input angle of full aperture
conversion efficiency
