Nd:YVO4是一种重要的激光晶体,广泛的应用到各种激光器中,本论文着重阐述不同的偏振光对应Nd:YVO4的受激发射截面不同从而导致该谱线的增益不同,并从实验上给出了定量的结果,实验表明对于a-cut的Nd:YVO4当偏振态由π到σ变化时,受激截面由21.5×1019cm2变化到14.3×1019cm2,对应的激光输出功率也由4.1 W变化到1.7 W。利用此原理提出了一种全新的弱增益谱线与强增益谱线的和频方法,并利用此方法实现了593.5 nm激光的运转。 Nd: YVO4 is a kind of important laser crystal, which is widely used in various lasers. This dissertation focuses on the difference of stimulated emission cross sections of different polarized light corresponding to Nd: YVO4, The experimental results show that for a-cut Nd: YVO4, when the polarization state changes from π to σ, the stimulated section changes from 21.5 × 10 19 cm 2 to 14.3 × 10 19 cm 2, and the corresponding laser output power also increases from 4.1 W Change to 1.7 W. Based on this principle, a new sum-frequency method of weak gain spectrum and strong gain spectrum is proposed. By this method, the operation of 593.5 nm laser is realized.