The use of a spherical mirror Fabry–Perot cavity as a mirror of variable reflectivity for near monochromatic light is demonstrated herein. The results of an experimental test of two control systems for the variable mirror are presented. It is shown that the reflectivity of our mirror can be controllably varied over a wide range. This technique has application in laser interferometric gravitational-wave detection.
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Strain et al. (1994) studied this question.