Overview of self-mixing interferometer applications to mechanical engineering

Donati, Silvano; Norgia, M.

doi:10.1117/1.oe.57.5.051506

Cited by 41 publications

(20 citation statements)

References 59 publications

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“…We have also verified that a network trained in the 10-100 Hz frequency band can also meaningfully reconstruct displacements including frequencies of hundreds of Hz, provided the measurement sampling rate is adapted. Thus, the neural network strength lies less in the absolute precision that it allows than in its robustness against detailed experimental conditions and versatility across the "sub-wavelength/analog" and "beyond wavelength/digital" classification [6] for arbitrarily complex waveforms.…”

Section: Discussionmentioning

confidence: 99%

“…For its simplicity and versatility, many applications have been envisioned and perhaps the most immediate is that of displacement measurement. Two limit regimes are considered [6]: that of very small displacement (much smaller than the laser wavelength) or the opposite case where the displacement takes place over a very large number of wavelengths. In the first case, information about the target displacement can be retrieved from fitting the shape of the interferometric signal.…”

Section: Introductionmentioning

confidence: 99%

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Convolutional neural network for self-mixing interferometric displacement sensing

Barland,

Gustave

2021

Preprint

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Self mixing interferometry is a well established interferometric measurement technique. In spite of the robustness and simplicity of the concept, interpreting the self-mixing signal is often complicated in practice, which is detrimental to measurement availability. Here we discuss the use of a convolutional neural network to reconstruct the displacement of a target from the self mixing signal in a semiconductor laser. The network, once trained on periodic displacement patterns, can reconstruct arbitrarily complex displacement in different alignment conditions and setups. The approach validated here is amenable to generalization to modulated schemes or even to totally different self mixing sensing tasks.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Convolutional neural network for self-mixing interferometric displacement sensing

Barland,

Gustave

2021

Preprint

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“…It should be noted that laser Doppler sensors based on the self-mixing effect due to re-injection into the laser cavity of a scattered or reflected component have shown high efficiency in the contactless measurement of movements, velocities, vibrations, the direction of movement of objects, etc. (see, for instance, [39–41] and references therein). Such an approach makes it possible to develop based on, for example, semiconductor lasers, sensors that have high sensitivity, low cost and compactness.…”

Section: Introductionmentioning

confidence: 99%

Amplification of optical signals in a bistable vertical-cavity surface-emitting laser by vibrational resonance

Chizhevsky

2021

Phil. Trans. R. Soc. A.

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The paper presents the results of the experimental study of an application of the phenomenon of vibrational resonance (VR) for enhancement of the response of a bistable vertical-cavity surface-emitting laser (VCSEL) to the effect of optical modulating signals. Specifically, two different cases were investigated: (a) the control of all-optical switching caused by a modulated orthogonal optical injection from another VCSEL and (b) the amplification of autodyne signals from a vibrating diffusely reflecting surface in the self-mixing optical interferometry. It is experimentally demonstrated that an application of the phenomenon of VR in both cases studied leads to a strong amplification of the input optical signals by a factor from 10 to 200 depending on the experimental conditions with respect to the initial values. The effect of the asymmetry of a bistable potential on the amplification factor was also studied. The results obtained can be used to improve all-optical switchings for application in communication systems and enhancement of autodyne signals in self-mixing optical interferometry. This article is part of the theme issue ‘Vibrational and stochastic resonance in driven nonlinear systems (part 1)’.

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“…As an emerging optical technique during the last several decades, laser self-mixing interferometry (SMI) has always attracted lots of attentions from institutes worldwide [1]. Laser diodes (LD) are always the first choices when implementing SMI measurement mainly because of miniature configuration, low cost and easy detection with built-in photodiodes (PD) [2], [3].…”

Section: Introductionmentioning

confidence: 99%

Influence of Fluorescence to Photon Lifetime Ratio on Detection Sensitivity in Laser Self-Mixing Interferometry

2020

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Laser self-mixing interferometry (SMI) has been widely applied in the fields of precision measurement in scientific research, industry and biomedicine, and most researchers preferentially utilize laser diodes (LD) as light sources due to their compact structure and low cost. In most SMI cases, detection sensitivity rather than structure and cost is always the first concern. So in this article, we concentrate on an influencing factor on detection sensitivity named fluorescence to photon lifetime ratio (FPLR) which is an inherent parameter of the active material in a laser cavity. Derivation and simulation based on the time delayed rate equations are followed to validate the significant role played by the FPLR, then experiments according to different laser types including solid state lasers (SSL) and LDs are implemented to further prove the factor mentioned. Results demonstrate that SSLs always have higher detection sensitivity to feedback light than LDs, and is always more suitable to be applied in precision measurement. Additionally, the Yb:YAG laser is more sensitive than the Nd:YAG one. Increasing the pumping level from the threshold will decrease the SMI signal's sensitivity, and reducing laser feedback strength will also decrease the SMI signal's sensitivity. The findings from this article are beneficial to studying laser feedback sensitivity and selecting appropriate laser types in designing SMI sensors or instruments. Though with the disadvantages of large size and high cost, SSLs may be more suitable light sources in the field of high performance SMI sensing if miniaturization and cost are not the significant consideration. INDEX TERMS Laser self-mixing interferometry, fluorescence to photon lifetime ratio, sensitivity, solid state laser, laser diode.

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Overview of self-mixing interferometer applications to mechanical engineering

Cited by 41 publications

References 59 publications

Convolutional neural network for self-mixing interferometric displacement sensing

Convolutional neural network for self-mixing interferometric displacement sensing

Amplification of optical signals in a bistable vertical-cavity surface-emitting laser by vibrational resonance

Influence of Fluorescence to Photon Lifetime Ratio on Detection Sensitivity in Laser Self-Mixing Interferometry

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