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Four-Wave Mixing in Alexandrite Crystals,
OKLAHOMA STATE UNIV STILLWATER DEPT OF PHYSICS
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Degenerate four-wave mixing was observed in alexandrite crystals BeAl2O4Cr3, and the signal beam efficiency and decay rate were measured as functions of pump beam-crossing angle, wave-length, and power. The results are consistent with scattering from excited-state population gratings related to the difference in despersion of the Cr3 ions in the ground and metastable states. These gratings can be selectively established with Cr3 ions in the inversion or mirror sites depending on excitattion wavelength. Strong scattering occurs only for pump beams polarized parallel to the b direction of the crystal. Originator- supplied keywords include Lasers, Alexandrite, Non-Linear Optics.
APPROVED FOR PUBLIC RELEASE