Achieving high resolution measurement using laser diode operating at period one

Authors

Yuxi Ruan, University of WollongongFollow
Bairun Nie, University of WollongongFollow
Yanguang Yu, University of WollongongFollow
Jiangtao Xi, University of WollongongFollow
Qinghua Guo, University of WollongongFollow
Jun Tong, University of WollongongFollow
Zhuqiu Chen, University of WollongongFollow

RIS ID

141170

Publication Details

Y. Ruan, B. Nie, Y. Yu, J. Xi, Q. Guo, J. Tong & Z. Chen, "Achieving high resolution measurement using laser diode operating at period one," Proceedings of SPIE - The International Society for Optical Engineering, vol. 11197, 2019.

Abstract

Copyright 2019 SPIE. When a part of light emitted by a laser is back-reflected or back-scattered from an external target and re-enters the laser cavity, both the laser intensity and its wavelength can be modulated. This is so-called self-mixing effect (SME), the optical feedback interferometry (OFI) utilizes such effect in an LD developed various applications. In this paper, we use a dualcavity OFI system that operating in period one state, the laser intensity from this system exhibits an oscillation with its amplitude modulated by a traditional single cavity OFI signal. The dual-cavity OFI system has the same measurement resolution as the single cavity which is half laser wavelength. This paper developed a method to improve the resolution by using fringe subdivision. Our simulation result shows that this method can achieve subnanometer resolution.