Title

Suppression of undamped relaxation oscillation in a laser self-mixing interferometry sensing system

Publication Name

Optics Express

Abstract

Undamped relaxation oscillation (RO) in a laser self-mixing interferometry (SMI) system may occur in some common application conditions, which may impact the stable operation of the system and degrade its sensing performance. In this work, we proposed to suppress the undamped RO by controlling the system operation parameters in a laser SMI sensing system. By numerically solving the famous Lang Kobayashi equations, the stability of a laser SMI system in a 3-parameter space of external cavity length, injection current and optical feedback factor were investigated. Based on the stability analyses, we determined the system operation conditions required for suppressing the undamped RO and derived an analytical expression for describing the relationship between the operation parameters. An experimental SMI system based on a laser diode (Sanyo, DL4140-001s) was implemented and verified the suppressing method. The experimental results showed that the SMI system in a moderate feedback regime can operate in steady state without undamped RO by setting proper operation parameters. This work provides useful guidance to design a stable SMI sensing system for practical applications.

Open Access Status

This publication may be available as open access

Volume

30

Issue

7

First Page

11254

Last Page

11265

Funding Number

20C1791

Funding Sponsor

Education Department of Hunan Province

Share

COinS
 

Link to publisher version (DOI)

http://dx.doi.org/10.1364/OE.453563