title: Characterization of the phase modulation property of a free-space electro-optic modulator by interframe intensity correlation matrix.
abstract: Characterization of a phase modulator or phase shifter has always been an integral part of phase-modulating or phase-adjusting applications. We propose a simplified approach to characterize a phase modulator by investigating the performance of phase shifts from grabbed interferograms using the phase extraction method. After reviewing some phase analysis techniques, the interframe intensity correlation (IIC) matrix method is introduced to the investigation. The proposed strategy is illustrated by the measurement of a free-space electro-optic modulator (EOM). Placing the modulator in one arm of a Michelson interferometer, the global phase shifts are estimated by the IIC method from the phase-stepped interferograms. Experimental results demonstrate the tested EOM has a phase modulation response of at least 2π  rad with a π/20  rad modulation precision for λ=1064  nm. In addition, our method is applicable to various types of phase modulator or phase shifter calibration, e.g., electro-optic phase modulator, spatial light modulator, or piezoelectric transducer (PZT).
authors: School of Opto-Electronic Information, University of Electronic Science and Technology of China, No. 4, Section 2, North Jianshe Road, Chengdu 610054, China.
authors: Huimin
authors: H
authors: Yue
authors: Lei
authors: L
authors: Song
authors: Zexiong
authors: Z
authors: Hu
authors: Hongxiang
authors: H
authors: Liu
authors: Yong
authors: Y
authors: Liu
authors: Yongzhi
authors: Y
authors: Liu
authors: Zengshou
authors: Z
authors: Peng