Abstract

We study crystalline fluoride microresonators for mid-infrared (mid-IR) applications. Whispering gallery mode resonators were fabricated with ${\mathrm{BaF}}_2$, ${\mathrm{CaF}}_2$, and ${\mathrm{MgF}}_2$ crystals. The quality factors were measured at wavelengths of 1.56 and 4.58 μm. The impacts of post-fabrication processing, impurities, and surface water are highlighted. The mid-IR optical losses due to multiphoton absorption are measured. It is found that ${\mathrm{MgF}}_2$ resonators have a room temperature $Q$-factor of $8.3\times {10}^6$ at a wavelength of 4.58 μm, limited by multiphoton absorption.

© 2016 Optical Society of America

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