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Fluoride microresonators for mid-IR applications (1602.00736v1)
Published 1 Feb 2016 in physics.optics
Abstract: We study crystalline fluoride microresonators for mid-infrared applications. Whispering gallery mode resonators were fabricated with BaF$_2$, CaF$_2$ and MgF$_2$ crystals. The quality factors were measured at wavelengths of 1.56 {\mu}m and 4.58 {\mu}m. The impacts of fabrication technique, impurities, multiphonon absorption and surface water are investigated. It is found that MgF2 resonators have room temperature Q factor of $8.3\times 106$ at wavelength of 4.58 {\mu}m, limited by multiphonon absorption.
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