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Mirror Losses (Absorption&Scatter) VS.Wavelength Maximum Losses Typical Losses |
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High Finesse Ultra Low Expansion (ULE®) Reference Cavities Stable, high finesse Fabry-Perot cavities are commonly used as short term frequency standards for laser frequency stabilization. REO manufactures highly stable Fabry-Perot resonators by optically contacting low loss mirrors to precision ULE spacers. The reflectivity of the mirrors can be adjusted to optimize resonator throughput or finesse -finesse value approaching one million are achievable. The ultra low expansion material and optical contacting minimize drifts due to thermal expansin and bonding materials. The mirror curvatures and the spacer length are selected to achieve highly nondegenerate resonators. The spacers include a vent hole which allow evacuation when installed in a vacuum chamber. The resulting cavities provide frequency references that are useful in stabilizing laser to the sub-hertz range. REO manufactures two standard configurations designed for nondegeneracy. The mirror substrates are coated for customer specified finesse and wavelength range. Low loss mirror catings are available in the 250nm to 3000nm wavelength range. Please contact REO for estimates of available finesse and throughout at specific wavelength. |