摘要
对LD泵浦的掠入射板条放大器链系统激光介质的热效应进行研究。针对掠入射放大器结构建立了相应的热力学模型,对激光介质的温度场分布、热致波前畸变和热透镜效应进行了详细的理论分析。利用有限元分析软件COMSOL模拟了晶体内部的温度、应力及应变的分布情况,并进一步讨论了板条厚度、泵浦尺寸以及种子光入射角对光程差和热透镜造成的影响。结果表明,随着泵浦光斑尺寸和种子光入射角的增大,光程差变小,热透镜效应减弱;板条厚度对光程差和热透镜的影响较小。模拟计算结果对于预测板条热效应的强弱、热效应的补偿,以及放大器链结构参数的设计提供了依据。
The theoretical experimental studies on thermal effect of LD side-pumped grazing-incidence slab chain were car- ried out. The thermodynamic model of amplifier grazing-incidence slab amplifier was built up. The temperature distribution, thermal distortion and thermal lensing effect were analyzed in detail. Also, the temperature distribution, thermal stress and ther- mal strain were simulated by finite element analysis. The influence of different incidence angle, pumping region and slab thickness on the thermal focal length and the optical path difference was discussed. The simulation results provided a basis for predicting the thermal effect, compensating thermal effect and designing amplifier chain.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2015年第5期43-49,共7页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(613778023)
北京市自然科学基金项目(4112005)
关键词
掠入射板条放大器
热效应
热透镜
光程差
热畸变
grazing-incidence slab amplifier
thermal effect
thermal lens
optical path difference
thermal distortion
