Fluoride microresonators for mid-IR applications
Abstract
We study crystalline fluoride microresonators for mid-infrared applications. Whispering gallery mode resonators were fabricated with BaF2, CaF2 and MgF2 crystals. The quality factors were measured at wavelengths of 1.56 μm and 4.58 μm. 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× 106 at wavelength of 4.58 μm, limited by multiphonon absorption.
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