28 April 2008 IR single beam dynamic holographic interferometer with three channels (two optical and one electrical)
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Abstract
We describe novel type of the single-beam dynamic holographic interferometer, that have two optical (based on beam coupling) and one electrical channels (based on the holographic current). Two optical channels are due to the simultaneous recording of the dynamic reflection and transmission gratings. Transmission-grating channel is sensitive to the transversal phase modulation, while reflection-grating channel allow detecting longitudinal phase modulation. Simultaneous detection of three phase-modulated signals allows improving reliability and sensitivity of the dynamic holographic interferometry. We develop model that explain transient enhancement of the holographic current and beam coupling in the crystal with two mobile charge carriers of different signs with contribution from the gradient-force current. Calculations for the ramp phase modulation and step-like phase modulation predict quadrature response for the beam coupling and phase-sign sensitive response for the holographic current. Theoretical model is compared with the experiments on the ferroelectric-semiconductor SPS and semiconductor CdTe crystals.
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N. Kukhtarev, T. Kukhtareva, Y. Gnatenko, P. Bukivskij, R. Gamernyk, "IR single beam dynamic holographic interferometer with three channels (two optical and one electrical)", Proc. SPIE 7003, Optical Sensors 2008, 700327 (28 April 2008); doi: 10.1117/12.786282; https://doi.org/10.1117/12.786282
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