Open AccessDevelopment of dual-wavelength fiber ring laser and its application to step-height measurement using self-mixing interferometry
Author(s) -
Shaoshuo Ma,
Fang Xie,
L. Chen,
Y. Z. Wang,
Liu Dong,
Keqiang Zhao
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.005693
Subject(s) - optics , ring laser , materials science , laser , interferometry , wavelength , fiber laser , fiber bragg grating , dispersion shifted fiber , optical fiber , fiber optic sensor , physics
A dual-wavelength erbium-doped fiber (EDF) ring laser was developed and its application to step-height measurement using two-wavelength self-mixing interferometry (SMI) was demonstrated. The fiber laser can emit two different wavelengths without any laser mode competition. It is composed of two EDF laser cavities and employs fiber Bragg gratings to determine which wavelengths are emitted. The step heights can be measured using SMI of the two wavelengths, and the maximum height that can be measured is half the synthetic wavelength of the two wavelengths. A step height of 1mm was constructed using two gauge blocks and then measured using the laser. The measurement was repeated ten times, and the standard deviation of the measurements was 2.4nm.