Abstract

In former times the output characteristics of Nd-lasers with adaptive loop resonator based on the intracavity four-wave mixing in the Cr-doped Q-switches were investigated [1,2]. This paper is devoted to the results of the experimental study of the ability of this type of resonator to compensate the high magnitude of optical phase distortions due to the phase conjugation. For the investigation these features we used the loop resonator (Fig.1), formed by the output coupler (OC), three high reflective mirrors (HR1, HR2, HR3) and nonlinear medium M (Cr⁴⁺:GSGG crystal, also used as passive Q-switch). To create different degrees of the wave front distortions we used the nonuniformly etched glass plates GP, placed inside the cavity. During the experiment the nonlinear medium M is moved along Z direction, parallel to the optical axis of resonator (Fig.1). At two end points the crossing of the beams was outside the nonlinear medium and the resonator operated as a common one, but in the medium point the crossing of the beams was inside the Q-switch and four-wave mixing took place.

© 2000 IEEE