Effects of external reflector alignment in sensing applications of optical feedback in laser diodes

Addy, Richard C.; Palmer, A. W.; Thomas, K. Renil; Grattan, V.

doi:10.1109/50.545785

Cited by 45 publications

(12 citation statements)

References 11 publications

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“…However, we have observed (see Figure 12) a very interesting feature when the mirror target and the fibre-end are slightly misaligned: the beat frequency is doubled. This phenomenon has already been reported in the literature 13 and is due to a quadruple stroke in the cavity. This configuration allows to double the sensitivity of the device for the displacement measurement.…”

Section: Displacement Reconstructionsupporting

confidence: 69%

Extrinsic fibre Fabry-Perot interferometer for vibration and displacement measurement: the benefit of polarization decomposition

et al. 2004

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International audienceWe have successfully developed a new design of an extrinsic fibre Fabry-Perot interferometer (EFPI) sensor dedicated to the characterization of vibration and displacement of a target. This device, based on a low finesse Fabry-Perot cavity formed by the end of a 'sensing' optical fibre and the target, gives information on the direction of the motion without the use of an additional reference arm. The incoming light, emitted by a 1310 nm laser diode, is decomposed according to two orthogonal polarization orientation inside the cavity. The two resulting interference signals are then carried back by the same optical fibre and sent to two photodiodes via a coupler and a polarizing beam splitter. With a relativelysimple signal processing, a precision of lambda/4 is achieved for the measurement of the displacement, for which the direction is also extracted. In addition, one can determine the velocity of the motion, that have been successfully compared with a reference sensor. The use of a polarization maintaining fibre as sensing arm, not mandatory formonitored laboratory set-up, allows the use of this sensor principle even with external perturbation (temperature changes, mechanical stress...)

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Section: Displacement Reconstructionsupporting

confidence: 69%

Extrinsic fibre Fabry-Perot interferometer for vibration and displacement measurement: the benefit of polarization decomposition

et al. 2004

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“…This phenomenon is called multiple self-mixing interferometry. 51 Jiang et al 52 proposed a demodulation algorithm based on the power spectral analysis for multiple self-mixing interferometry. Its precision can reach as high as λ∕47.6, and the absolute error of amplitude is ∼0.075 μm.…”

Section: Vibration Measurementmentioning

confidence: 99%

Laser feedback interferometry and applications: a review

Niu

2017

Opt. Eng

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The progress on laser feedback interferometry technology is reviewed. Laser feedback interferometry is a demonstration of interferometry technology applying a laser reflected from an external surface, which has features including simple structure, easy alignment, and high sensitivity. Theoretical analysis including the Lang-Kobayashi model and three-mirror model are conducted to explain the modulation of the laser output properties under the feedback effect. In particular, the effect of frequency and polarization shift feedback effects are analyzed and discussed. Various applications on various types of lasers are introduced. The application fields range from metrology, to physical quantities, to laser parameters and other applications. The typical applications of laser feedback technology in industrial and research fields are discussed. Laser feedback interferometry has great potential to be further exploited and applied.

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“…Thus, they have been widely used for displacement measurement [7], absolute distance [8], vibrometry [9], velocity measurement [10], and Z. Zeng · S. Zhang ( ) · Y. Tan · P. Zhang · Y. Li The State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China e-mail: zsl-dpi@mail.tsinghua.edu.cn Fax: +86- imaging [11]. In previous researches, the double feedback effects on the output power and spectral characteristics of semiconductor lasers with asymmetric external cavity have been studied systematically [12][13][14], in which the fringes of the intensity output can be doubled. Tan et al [15] presented the feedback effects in a single-mode microchip Nd:YAG laser with a tilted external cavity at high feedback level; in this case, the fringes frequency is quadrupled compared with the conventional optical feedback.…”

Section: Introductionmentioning

confidence: 99%

Single high-order round-trip feedback effects in orthogonally polarized dual frequency laser

et al. 2012

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We present the effects of single high-order roundtrip feedback in orthogonally polarized dual frequency laser. The high quality intensity fringes of two orthogonally polarized lights are obtained, which are cosine-like. The fringe frequency of a single high-order round-trip feedback is five times that of the conventional optical feedback. Even higher frequencies are possible with this setup. Particularly, there is a phase difference between two orthogonal polarized lights in single high-order round-trip feedback and the phase difference is determined by the feedback order, the length of the external cavity, and the frequency difference of the two orthogonal polarized lights. A theoretical analysis based on a compound cavity model of a dual frequency laser agrees well with the experimental results. These results provide a potential application in precision measurement with both directional discrimination and high optical resolution.

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Effects of external reflector alignment in sensing applications of optical feedback in laser diodes

Cited by 45 publications

References 11 publications

Extrinsic fibre Fabry-Perot interferometer for vibration and displacement measurement: the benefit of polarization decomposition

Extrinsic fibre Fabry-Perot interferometer for vibration and displacement measurement: the benefit of polarization decomposition

Laser feedback interferometry and applications: a review

Single high-order round-trip feedback effects in orthogonally polarized dual frequency laser

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