Abstract

We have performed nondegenerate four-wave mixing measurements on Cr3+ ions in three crystals: BeAl2O4, Gd3Sc2Ga3O12, and LaMgAl11O19. Two laser beams of the same frequency were used to resonantly pump one of the absorption bands of Cr3+, and probe beams with three different wavelengths ranging from 442 to 1064 nm were used to generate a signal from the laser-induced population grating. The observed four-wave mixing signal strength was found to increase as the wavelength of the probe beam was decreased. A model was utilized to explain these results based on the change in polarizability of the Cr3+ ions when they are in the metastable state versus the ground state, and it was found that the dispersion effects can be described by a single-oscillator model with the lowest-energy charge-transfer transition of Cr3+ making the dominant contribution to the signal.

© 1990 Optical Society of America

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