Excitation of Coherent Raman Beats in Rare Earth Solids with a Bichromatic Laser Field.

Abstract

A new method is presented for measuring coherent Raman beats in systems with a wide spectral range that works even for weakly allowed optical resonance lines. A bichromatic pump laser field is used to resonantly pump a coherent excitation in the material, and a monochromatic test laser field, whose frequency coincides with that of one component of the pump laser beam.