Abstract

To improve the properties of a pulsed Nd: YAG laser system (e. g. temporal and spatial structure and coherence length) we used phase conjugation properties at stimulated Brillouin backward scattering (SBS) in an aceton cell for Q-switching, high-quality amplification and mode-locking. With an aceton SBS cell inside the laser cavity we found that a transition from an unstable operation at low intensities to stable one at high intensity takes place, which results in the existence of a focal point outside the cavity. We measured a different temporal behavior of the ns pulses in that focal point and its periphery. Mostly one or two 3 ns pulses were generated, the coherence length was about 0.8 m, and the Gaussian spatial structure without any substructures was obtained.

© 1992 IQEC