Circular carrier squeezing interferometry (CCSI) is proposed and applied to suppress phase shift error in simultaneous phase-shifting point-diffraction interferometer (SPSPDI). By introducing a defocus, four phase-shifting point-diffraction interferograms with circular carrier are acquired, and then converted into linear carrier interferograms by a coordinate transform. Rearranging the transformed interferograms into a spatial-temporal fringe (STF), so the error lobe will be separated from the phase lobe in the Fourier spectrum of the STF, and filtering the phase lobe to calculate the extended phase, when combined with the corresponding inverse coordinate transform, exactly retrieves the initial phase. Both simulations and experiments validate the ability of CCSI to suppress the ripple error generated by the phase shift error. Compared with carrier squeezing interferometry (CSI), CCSI is effective on some occasions in which a linear carrier is difficult to introduce, and with the added benefit of eliminating retrace error.

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fourier spectrum suppress phase shift error in simultaneous phaseshifting pointdiffraction interferometer spspdi spatialtemporal fringe carrier squeezing interferometry csi ccsi circular carrier four phaseshifting pointdiffraction interferograms extended phase stf inverse coordinate transform

Jian Zhao, Qinyuan Sun,Donghui Zheng, Axel Schülzgen, Jinpeng Li, Wenhua Zhu, James Anderson, Lei Chen,.Circular carrier squeezing interferometry: Suppressing phase shift error in simultaneous phase-shifting point-diffraction interferometer. 102 (0),.

Jian Zhao, et al."Circular carrier squeezing interferometry: Suppressing phase shift error in simultaneous phase-shifting point-diffraction interferometer" 102

Jian Zhao, Qinyuan Sun,Donghui Zheng, Axel Schülzgen, Jinpeng Li, Wenhua Zhu, James Anderson, Lei Chen,"Circular carrier squeezing interferometry: Suppressing phase shift error in simultaneous phase-shifting point-diffraction interferometer"