Enhancing Phase Measurement by a Factor of Two in the Stokes Correlation

Engineering Proceedings

article

Amit Yadav¹  Tushar Sarkar¹  Takamasa Suzuki²  Rakesh Kumar Singh¹ 

[1] Laboratory of Information Photonics and Optical Metrology, Department of Physics, Indian Institute of Technology ,(Banaras Hindu University);Department of Electrical and Electronic Engineering, Niigata University

关键词: vortex beam;    speckle;    coherence;    phase imaging;   

DOI  :  10.3390/HMAM2-14273

来源: mdpi

【 摘 要 】

Phase loss is a typical problem in the optical domain, and optical detectors only measure the amplitude distribution of a signal without its phase. However, an optimal phase is desired in a variety of practical applications, such as optical metrology, nondestructive testing, and quantitative microscopy. Several methods have been proposed to quantitatively measure phase, among which interferometry is one of the most commonly used. An intensity interferometer has also been used to recover phase and enhance the phase difference measurement via the intensity correlation. In this paper, we present and examine another technique based on the Stokes correlation for enhancing phase measurement by a factor of two. The enhancement in phase measurement is accomplished through an evaluation of the correlation between two points of Stokes fluctuations of randomly scattered light and by recovering the enhanced phase of the object by using three-step phase shifting along with the Stokes correlations. This technique is expected to be useful for imaging and the experimental measurement of the phase of a weak signal.

【 授权许可】

Unknown