Abstract
We study crystalline fluoride microresonators for mid-infrared (mid-IR) applications. Whispering gallery mode resonators were fabricated with , , and 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 resonators have a room temperature -factor of at a wavelength of 4.58 μm, limited by multiphoton absorption.
© 2016 Optical Society of America
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