A phase-lock interference microscope (PLIM) has been designed and constructed. The instrument measures optical phase in real time with analog output voltages proportional to phase and position. The PLIM has been used to measure gradient index profiles in optical fibers, wall thicknesses of microballoons for laser induced fusion, the phase of biological specimens, and the surface finish of optical surfaces. The peak-to-peak noise of the instrument is lambda/50.
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Leiner et al. (1978) studied this question.
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