Determination of velocity of self-mobile phytoplankton using a self-mixing thin-slice solid-state laser

Sudo, Seiichi; Ohtomo, Takayuki; Takahashi, Yohei; Oishi, Tomohiko; Otsuka, Kenju

doi:10.1364/ao.48.004049

Cited by 32 publications

(25 citation statements)

References 23 publications

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“…PHYSICAL REVIEW A shifted optical feedback has been used in metrology [5], for example in self-mixing Laser Doppler Velocimetry (LDV) [6][7][8] and in Laser Optical Feedback Imaging (LOFI) [9][10][11].…”

Section: Nonlinear Modification Of the Laser Noise Power Spectrum Indmentioning

confidence: 99%

Nonlinear modification of the laser noise power spectrum induced by frequency-shifted optical feedback

et al. 2016

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In this article, we study the non-linear coupling between the stationary (i.e. the beating modulation signal) and transient (i.e. the laser quantum noise) dynamics of a laser subjected to frequency shifted optical feedback. We show how the noise power spectrum and more specifically the relaxation oscillation frequency of the laser are modified under different optical feedback condition. Specifically we study the influence of (i) the amount of light returning to the laser cavity and (ii) the initial detuning between the frequency shift and intrinsic relaxation frequency. The present work shows how the relaxation frequency is related to the strength of the beating signal and the shape of the noise power spectrum gives an image of the Transfer Modulation Function (i.e. of the amplification gain) of the nonlinear-laser dynamics.The theoretical predictions, confirmed by numerical resolutions, are in good agreements with the experimental data.

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Section: Nonlinear Modification Of the Laser Noise Power Spectrum Indmentioning

confidence: 99%

Nonlinear modification of the laser noise power spectrum induced by frequency-shifted optical feedback

et al. 2016

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“…45 This effect is remarkably universal, having been demonstrated at numerous wavelengths and with different device structures, including in THz QCLs. [46][47][48][49][50][51][52][53][54] The SM effect, while regarded as a nuisance in telecommunications applications, has been harnessed for a range of sensing purposes, including the measurement of displacement, velocity, and fluid flow, as well as for imaging.…”

Section: Self-mixing Phenomenon In Thz Qclsmentioning

confidence: 99%

Optical feedback effects on terahertz quantum cascade lasers: modelling and applications

et al. 2016

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Terahertz (THz) quantum cascade lasers (QCLs) are compact sources of radiation in the 1-5 THz range with potential for applications in sensing and imaging. Laser feedback interferometry (LFI) with THz QCLs is a technique utilizing the sensitivity of the QCL to the radiation reflected back into the laser cavity from an external target. We will explore the applications of LFI in biological tissue imaging and will show that the confocal nature of the QCL in LFI systems, with their innate capacity for depth sectioning, makes them suitable for skin diagnostics with the well-known advantages of more conventional confocal microscopes. A demonstration of discrimination of neoplasia from healthy tissue using a THz, LFI-based system in the context of melanoma is presented using a transgenic mouse model.

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“…[27][28][29][30][31][32][33][34][35][36] Whilst this phenomenon can be undesirable in telecommunications targeted for applications, such as communications, it can be exploited for sensing purposes. Indeed, it has been used to measure displacement, velocity, and fluid flow, as well as for coherent and incoherent imaging.…”

Section: Self-mixing Phenomenon In Thz Qclsmentioning

confidence: 99%

THz QCL self-mixing interferometry for biomedical applications

et al. 2014

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In this paper, we introduce the self-mixing phenomenon in terahertz quantum cascade lasers (THz QCLs) and present recent advancements in the development of coherent THz imaging and sensing systems that exploit the self-mixing effect. We describe an imaging method which utilises the interferometric nature of optical feedback in a THz QCL to employ it as a homodyning transceiver. This results in a highly sensitive and compact scheme. Due to the inherently low penetration depth of THz radiation in hydrated biological tissue, imaging of superficial skin is an ideal application for this technique. We present results for imaging of excised skin tissue, showing high-contrast between different tissue types and pathologies.

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Determination of velocity of self-mobile phytoplankton using a self-mixing thin-slice solid-state laser

Cited by 32 publications

References 23 publications

Nonlinear modification of the laser noise power spectrum induced by frequency-shifted optical feedback

Nonlinear modification of the laser noise power spectrum induced by frequency-shifted optical feedback

Optical feedback effects on terahertz quantum cascade lasers: modelling and applications

THz QCL self-mixing interferometry for biomedical applications

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