Abstract
The production of light at the combination frequency - by two incident-tunable coherent beams at the frequencies and , respectively, has been studied in CuCl, as is varied across the -exciton-polariton dispersion curve, and/or is varied across the longitudinal phonon-polariton dispersion curve. The interference of the excitonic and Raman resonances with the nonresonant electronic nonlinear susceptibility gives new information about the nonlinear properties of the exciton and its damping as a function of temperature. A detailed theoretical and experimental comparison with earlier work on two-photon absorption and second-harmonic generation in CuCl is presented.
- Received 7 May 1976
DOI:https://doi.org/10.1103/PhysRevB.14.4654
©1976 American Physical Society