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In article <[EMAIL PROTECTED]>, "mhr_54" <[EMAIL PROTECTED]> wrote: > Does anybody have a 33% reflectivity Ruby wavelength (694nm) laser mirror? Haven't put numbers into the etalon peak reflectivity vs refractive index calculation to check, but the peak reflectivity from a thick glass, quartz, sapphire, or ??? etalon might provide a low-cost (and low loss, high damage threshold) solution.
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