Abstract
The threshold power of Iaser-induced thermal scattering in a high-Q spherical silica microcavity is investigated theoretically as a function of diffraction parameter and the laser pump wavelength for twomode coupling. The threshold power is found to be comparable in order of magnitude with the threshold of Raman lasing and thermal instability in spherical silica microcavities and amounts to 100 fuW for a resonator with a radius of 35 fu m at a pump wavelength of 0.840 fu m. This ensures the application of microcavities as high-sensitive tools for measuring temperature, thermal conductivity, and heat capacity and as stabilizers for microlasers.
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