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Abstract: We report on a study of optical properties of whispering gallery mode resonators made out of as-grown nominally pure lithium niobate crystals. We have observed a surprising dynamic modification of the spectrum of the resonators illuminated with the near infrared light. We attribute this effect to the photorefractive damage of the resonator host material. [Copyright &y& Elsevier]

Abstract: We report on the fabrication technique of ultra high Q optical crystalline whispering gallery mode microresonators and discuss their properties. The technique is suitable for the majority of available optical crystals and for production of resonators with small size. To validate the method, we made CaF2 resonators with Q factors exceeding 4×108 and a diameter smaller than 100μm. A single mode resonator has also been fabricated. Possible utilization of these new resonators in quantum optics is discussed. [Copyright &y& Elsevier]