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
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