Characterizations of low-loss mirrors by measurements of cavity-decay time and of cavity finesse are reported near 850 nm. The lowest observed mirror loss is 1.6 × 10−6 (transmission plus absorption and scatter), which corresponds to a reflectivity of 0.9999984 and to a cavity finesse of 1.9 × 106.
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Rempe et al. (1992) studied this question.
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