Abstract
A new method of non-linear laser spectroscopy based on four-wave scattering of pump laser radiation into the probe laser cavity is suggested and realized. As a result of intracavity amplification there is an opportunity to investigate weak narrow resonances of different types including the resonances of photo-elastic scattering in optical materials and laser crystals. A theory describing this phenomenon is suggested and experiments with narrowband (1 MHz linewidth) tunable continuous-wave diode laser were carried out. It is shown that the four-wave scattering of pump laser radiation into the cavity of the probe laser can be used for measurement of dispersion of photo-elastic constants in solid and liquid dielectrics.
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