Open AccessSelf-Mixing Interferometer Based on Frequency Analysis Method for Accurate Refractive Index Measurement
Author(s) -
Yongbing Zhang,
Yingbin Wei,
Chenxi Chen,
Wencai Huang,
Xiulin Wang,
Huizhen Xu
Publication year - 2016
Publication title -
ieee photonics journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 73
eISSN - 1943-0655
pISSN - 1943-0647
DOI - 10.1109/jphot.2016.2520822
Subject(s) - engineered materials, dielectrics and plasmas , photonics and electrooptics
A new method based on self-mixing interference (SMI) for refractive index measurement by means of simply frequency analysis is proposed. The optical phase shift is implemented by translating a transparent object through a motorized stage with a setting velocity. Then, the refractive index is determined by the frequency of SMI fringes. A relative repeatability of refractive index estimated in 1.0 x 10-4 is achieved experimentally. This method has found that there exists an optimal velocity to achieve minimum error of refractive index measurement.