The stability output second harmonic generation ( shg ) experiment results of single - longitudinal mode and multi - longitudinal mode with long cavity were explained reasonably with these rate equations . the high polarization of fundamental wave in the isotropic laser media nd : yag with type - i critical phase - matching lbo was studied with the rate equations including polarization of fundamental light . using the polarization function of lbo , a quartz full - wave plate was introduced into the cavity , a kind of birefringent filter by considering the combination of the polarization function of the type - i critical phase - matching doubling frequency crystal lbo and the quartz whole - wave plate was constructed 將腔內(nèi)多縱模倍頻速率方程推廣應(yīng)用到準(zhǔn)三能級藍(lán)光激光器中,分析了一個(gè)縱模、兩個(gè)縱模、多個(gè)縱模時(shí)的噪聲情況,合理地解釋了實(shí)驗(yàn)中激光器單縱模運(yùn)轉(zhuǎn)以及長腔多縱模運(yùn)轉(zhuǎn)時(shí)穩(wěn)定輸出的實(shí)驗(yàn)現(xiàn)象,同時(shí)利用該速率方程分析了以各向同性激光晶體nd : yag為工作物質(zhì),類臨界相位匹配lbo為倍頻晶體的藍(lán)光激光器中基頻光偏振特性,合理利用類臨界相位匹配lbo倍頻晶體的偏振特性與引入的石英晶體全波片構(gòu)成雙折射濾光片,通過選單頻來抑制噪聲,獲得了藍(lán)光低噪聲的穩(wěn)定輸出。