一种新型LD大面泵浦周期性增益Nd:YVO₄板条晶体的理论分析

Theoretical Analysis of the Output of a Diode Face-Pumped Nd:YVO₄ Slab Laser with Periodic Gain

摘要: 提出了一种新型的LD大面泵浦周期性增益Nd:YVO₄板条晶体的激光器结构，这种结构能产生远场空间压窄的同相锁定极窄单峰输出；分析了周期性增益源的填充因子分别为60%，70%，80%，90%时对远场输出光斑强度分布的影响，填充因子为90%时获得了几乎无旁瓣的远场理想光斑分布；对比了周期性增益源均匀分布与非均匀分布时，远场输出光斑光强分布的差异，结果显示周期性增益源的非均匀分布将导致远场输出光斑的强度分布图形不光滑，且对称性降低。 The theoretical analysis of the output of a diode face-pumped Nd:YVO₄ slab laser structure with periodic gain is presented, with which in-phased locked output with highly spatially suppressed single-peak intensity distribution could be obtained. We demonstrate respectively that the intensity of the far field distribution with the filling factor of the periodic gain being 60%, 70%, 80%, 90% and obtain a suppressed far-field single peak with barely side-lobes. We discuss the difference of the far-field single-peak intensity distribution between the uniform periodic gain and non- uniform periodic gain, and get the result that the non-uniform periodic gain distribution makes the far-field single-peak rough and asymmetrical.