RING LASER RESONATOR WITH STIMULATED BRILLOUIN SCATTERING MIRROR

The results of an theoretical and experimental study of the properties of a ring resonator used with a Nd:YAG laser operating at 1.06 mu m are presented. The rates equations arepresented in a rotative system for an optical field distribution and inversion population obtaining the oscillation Conditions of a ring laser resonator. With this model a kinetic model for a ring laser resonator with stimulated Brillouin scattering mirror (SBS) was developed. The ring laser resonator contains four plane mirrors and a Nd:YAG rod with a small signal single pass gain. A Brillouin mirror contains a cell with CS(2) is put behind of a lens in exterior of ring resonator. The laser works, in free regime with a low coefficient laser resonator. When the intensity of laser radiation increases in the resonator, barrier of the stimulated Brillouin diffusion grows out of and the reflectivity of cell increase, so that the coefficient of resonator is switched Using a fast photodiode and a digital oscilloscope (2GHz) we measured the duration of the laser pulse and the energy with a Mollectron detector. The transversal structure Of output radiation intensity was monitorised usinga CCD camera and a SPIRICON system