Theoretical Research Of The Passively Q-Switched Intracavity Frequency-doubled Raman Lasers

Theoretical research of passivel Q-switched intracavity frequency-doubled Raman lasers was carried out. The rate equations of passively Q-switched intracavity frequency-doubled Raman lasers were deduced for the plane-wave approximation and approximation considering spatial distribution of pump beam and intracavity light, respectively. The rate equations were normalized. Passively Q-switched intracavity frequency-doubled Raman lasers were simulated, solved numerically to investigate the influences of the normalized initial population inversion density, normalized Raman gain coefficient, saturable absorber parameter, normalized frequency-doubled coefficient, beam size ratio of pump to fundamental laser and loss ratio of the first Stokes to fundamental laser on the pulse parameters of the first Stokes of passively Q-switched intracavity frequency-doubled Raman lasers. The results of the plane-wave approximation and approximation considering spatial distribution show similar trends despite some discrepancies. The theories and numerical results will help invent and design passively^-switched intracavity Raman lasers of high performance.