Abstract

Degenerate four-wave mixing measurements were made on several Nd3+-doped laser materials by resonantly pumping the Nd3+ ions. The dominant contribution to the signal under these conditions is associated with the difference in polarizabilities of the Nd3+ ions in the metastable state versus the ground state. Absolute measurements of the signal strengths imply a laser-induced polarizability change of the order of 0.01–0.05 Å3. The results indicate that, for the case of a single-shot laser amplifier system, the beam distortion induced by this population-induced change in the refractive index is comparable with the distortion arising from thermal effects.

© 1989 Optical Society of America

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