Numerical calculation of transfer coupling equation of externalresonator Raman laser with 579 nm

In order to increase output power and conversion efficiency of the external resonator Raman laser with KGd(WO4)2 crystal, the radiation transfer equations of the laser system were solved numerically with the method of area summation. The output intensity variation of the first order to the third order Stokes with time and the relaxation oscillation of the Raman laser were obtained. It was found that increasing the reflectivity of the output coupling mirror on the Raman cavity could increase the intracavity intensity of the first order Stokes, which made the energy conversion from the pump laser to the second order Stokes laser easier.