Laser Scanning Feedback Imaging System Based on Digital Micromirror Device

Wang, Yifan; Zhu, Konglin; Lu, Yueyue; Zhang, Shulian; Tan, Yidong

doi:10.1109/lpt.2019.2962611

Cited by 1 publication

(1 citation statement)

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“…Laser feedback interference occurs when a small portion of light emitted from a laser is reflected or backscattered by an external object and the reflected light reenters the laser cavity, leading to the modulation in both the amplitude and frequency of the lasing field [1,2]. Laser feedback interferometry (LFI) has been widely used in the past decades, such as velocity sensing [3,4], acoustic emission measurement [5,6], micro-displacement sensing [7,8] and quantum communication [9,10].…”

Section: Introductionmentioning

confidence: 99%

All-Fiber Laser Feedback Interferometry for Sequential Sensing of In-Plane and Out-of-Plane Displacements

Xie

Zhang

et al. 2023

Photonics

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In this paper, an all-fiber laser feedback interferometer (LFI) with a diffraction grating was developed for sequential measurement of in-plane and out-of-plane displacements without changing the optical arrangement. When the light emitted from an erbium-doped fiber ring laser is incident on a reflection grating at the Littrow angle, the diffracted light will return into the laser cavity along the original path, thus generating laser feedback interference. Experimental results reveal that the all-fiber system could achieve a precision of 40 nm in both in-plane and out-of-plane displacements sensing. Compared with the traditional all-fiber LFI, the proposed sensing system transfers the measuring scale from laser wavelength to grating period, and it has the advantages of good anti-interference performance and reliability.

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