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Proceedings Paper

Achieving high resolution measurement using laser diode operating at period one
Author(s): Yuxi Ruan; Bairun Nie; Yanguang Yu; Jiangtao Xi; Qinghua Guo; Jun Tong; Zhuqiu Chen
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Paper Abstract

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.

Paper Details

Date Published: 12 November 2019
PDF: 4 pages
Proc. SPIE 11197, SPIE Future Sensing Technologies, 111970I (12 November 2019); doi: 10.1117/12.2542592
Show Author Affiliations
Yuxi Ruan, Univ. of Wollongong (Australia)
Bairun Nie, Univ. of Wollongong (Australia)
Yanguang Yu, Univ. of Wollongong (Australia)
Jiangtao Xi, Univ. of Wollongong (Australia)
Qinghua Guo, Univ. of Wollongong (Australia)
Jun Tong, Univ. of Wollongong (Australia)
Zhuqiu Chen, Univ. of Wollongong (Australia)

Published in SPIE Proceedings Vol. 11197:
SPIE Future Sensing Technologies
Masafumi Kimata; Christopher R. Valenta, Editor(s)

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