A simplified and higher dynamic range version of the J₁…J₄ method for optical phase measurements

Abstract

A new and an improved version of the J1…J4 method for optical phase detection, named J1–J3 method, is described, which is more stable to phase drift and simpler for implementation than the original one. The sensor dynamic range is increased while maintaining the accuracy and the minimum detectable phase‐shift. The method is experimentally validated by using an electro‐optic intensity modulator. The agreement between theoretical and experimental results, based on the 1/f voltage noise, is demonstrated. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 54:387–392, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26533

Accurate displacement-measuring interferometer with wide range using an I2frequency-stabilized laser diode based on sinusoidal frequency modulation

“…The modulation index m can be determined using the harmonic intensities of the interference signal [15][16][17]. In this paper, the modulation index m was measured for the specific measurement range using the spectrum analyzer proposed [6].…”