Optical measurements with phase-conjugate mirrors
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- Kowarschik, R., Wenke, L., Baade, T. et al. Appl Phys B (1999) 69: 435. doi:10.1007/s003400050832
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Phase-conjugate mirrors on the basis of photorefractive crystals offer interesting possibilities of application for optical measurement systems. In this paper we report on the application of phase-conjugate mirrors (PCMs) for optical measurement techniques. We show different schemes for realizing PCMs and discuss characteristics such as reflectivity, fidelity, and time behavior.
We demonstrate that two-beam interferometers with PCMs and with a suitable phase-shifting unit in the reference arm have general advantages compared with conventional systems. It is shown that self-pumped PCMs (SPPCMs) could also be successfully used for novelty filtering systems comparing a present state of a signal phase with a reference phase. It is found that SPPCMs can improve both the axial and the lateral resolution of a confocal microscope. A 30% better resolution of the PCM system is established.