Abstract

Unlike coherent anti-Stokes Raman spectroscopy (CARS) involving vibrational transitions, CARS involving electronic states of rare earth ions in insulating crystals has shown only limited success.^1,2 This is mainly due to the small cross sections for spontaneous electronic Raman scattering in rare earth crystals. The magnitude of the resonant part of the third-order susceptibility which governs the CARS process χ^(3)R is generally proportional to the product of the spontaneous Raman cross section and the number density of ions.

© 1990 Optical Society of America