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.
David E. Zelmon, Steven T. Fenstermaker, William B. Poston, John D. Kunkel, Kevin T. Stevens, Greg Foundos, Alexis Payne, and 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 (Presented at SPIE LASE: February 01, 2017; Published: 21 April 2017); https://doi.org/10.1117/12.2256189.5387787285001.
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