7 March 2006 Laser-diode phase-shifting interferometer applied to joint-transform correlator
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A phase-shifting interferometer with a laser diode (LD) has been applied to a joint-transform correlator. An LD six-stepping interferometer is insensitive to the changes in laser power associated with the current variation. A new method producing a joint-transform phase correlator (JTPC) is presented in which the phase in a joint-power spectrum (JPS) of two inputs is measured by the technique of LD phase-shifting interferometry. A charge-coupled device records the JPS those recording optical layout is an on-axis type by using a Mach-Zehnder interferometer. A single centered correlation is generated by the numerical Fourier transformation of the measured phase. A JTPC exhibits sharper correlation peak than the conventional JTC. The experimental results with a JTPC are shown.
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Takeshi Takahashi, Takeshi Takahashi, Yukihiro Ishii, Yukihiro Ishii, } "Laser-diode phase-shifting interferometer applied to joint-transform correlator", Proc. SPIE 4101, Laser Interferometry X: Techniques and Analysis, (7 March 2006); doi: 10.1117/12.498391; https://doi.org/10.1117/12.498391

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