Kowarschik, R.R.KowarschikWenke, L.L.WenkeBaade, T.T.BaadeEsselbach, M.M.EsselbachKiessling, A.A.KiesslingNotni, G.G.NotniUhlendorf, K.K.Uhlendorf2022-03-032022-03-031999https://publica.fraunhofer.de/handle/publica/19483310.1007/s003400050832Phase-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 PCNIs and discuss characteristics such as reflectivity, fidelity, and time behavior. We demonstrate that two-beam interferometers with PCNIs and with a suitable phase-shifting unit in the reference arm have general advantages compared with conventional systems. It is shown that self-pumped PCNIs (SPPCNIs) 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 SPPCNIs can improve both the axial and the lateral resolution of a confocal microscope. A 30% better resolution of the PCM system is established. We demonstrate that two-beam interferometers with PCNIs and with a suitable phase-shifting unit in the reference arm have general advantages compared with conventional systems. It is shown that self-pumped PCNIs (SPPCNIs) 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 SPPCNIs can improve both the axial and the lateral resolution of a confocal microscope. A 30% better resolution of the PCM system is established.enPCMphase-conjugate mirrorphotrefractive crystalsself-pumped PCM620621journal article