连续波激光器腔内倍频晶体半解析分析方法的研究

连续波激光器系统腔内倍频非线性光学晶体吸收基频光辐射产生谐波的同时,也会在晶体内部产生非均匀温升,引起折射率变化,破坏位相匹配条件,影响激光器谐波转换效率.解决问题的关键是准确得出晶体内部温度场.由于激光器中激光模式和边界条件的复杂性,无法得到温度场的解析解.利用半解析热分析方法得出了晶体工作在TEM00模式下产生的温度场计算公式,分析了对温度场分布的各种影响.所得结果对连续波腔内倍频激光系统设计将起到指导作用.

Research of Semi-analytical Thermal Analysis Method of Nonlinear Optical Crystal with Intracavity Double Frequency in Continuous Wave Lasers

In continue-wave laser system intracavity double frequency nonlinear optical crystal absorbing fundamental light radiation will generate harmonic wave, at same time will induce crystal interior non-uniform temperature raise. And the thermal phenomena would cause crystal ’s refractive index non-homogeneous changes, destroyed crystal phase-matching condition, which influenced laser harmonic conversion efficiency. In laser system as mode and boundary condition are very complicated, analytic analysis of temperature field could not be obtained. In CW TEM00 laser system nonlinear optical crystal temperature field distribution is obtained by semi-analytical thermal analysis method, subsequently all kinds of parameter which influenced temperature field distribution are analyzed. All research results will play instructive effect at the optimum design of continuous wave intracavity double frequency laser system.