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Potassium terbium fluoride is a recently developed magneto-optic material which has been proposed for use as an optical isolator. We have performed measurements of the refractive index, thermo-optic coefficient, and stress-optic coefficient of this material. We present a temperature dependent Sellmeier equation along with calculations of temperature and refractive index profiles at various pump power levels in a diode pumped laser. The data are critical to the design of laser systems in which optical isolators are employed.
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David E. Zelmon, Steven T. Fenstermaker, William B. Poston, John D. Kunkel, Kevin T. Stevens, Greg Foundos, Alexis Payne, Kelvin Chang, "Stress-optic coefficients and temperature dependent refractive indices of potassium terbium fluoride (Conference Presentation)," Proc. SPIE 10085, Components and Packaging for Laser Systems III, 100850L (21 April 2017); https://doi.org/10.1117/12.2256189