1. Articles from Maxime Hugues

    1-3 of 3
    1. GaAs-Based Superluminescent Light-Emitting Diodes with 290-nm Emission Bandwidth by Using Hybrid Quantum Well/Quantum Dot Structures

      GaAs-Based Superluminescent Light-Emitting Diodes with 290-nm Emission Bandwidth by Using Hybrid Quantum Well/Quantum Dot Structures

      A high-performance superluminescent light-emitting diode (SLD) based upon a hybrid quantum well (QW)/quantum dot (QD) active element is reported and is assessed with regard to the resolution obtainable in an optical coherence tomography system. We report on the appearance of strong emission from higher order optical transition from the QW in a hybrid QW/QD structure. This additional emission broadening method contributes significantly to obtaining a 3-dB linewidth of 290 nm centered at 1200 nm, with 2.4 mW at room temperature.

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    2. Quantum Dot Superluminescent Diodes for Optical Coherence Tomography: Device Engineering

      Quantum Dot Superluminescent Diodes for Optical Coherence Tomography: Device Engineering

      We present a 18 mW fiber-coupled single-mode superluminescent diode with 85 nm bandwidth for application in optical coherence tomography (OCT). First, we describe the effect of quantum dot (QD) growth temperature on optical spectrum and gain, highlighting the need for the optimization of epitaxy for broadband applications. Then, by incorporating this improved material into a multicontact device, we show how bandwidth and power can be controlled. We then go on to show how the spectral shape influences the autocorrelation function, which exhibits a coherence length of <11 $mu$m, and relative noise is found to be 10 dB lower than that of a thermal source. Finally, we apply the optimum device to OCT of in vivo skin and show the improvement that can be made with higher power, wider bandwidth, and lower noise, respectively.

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    3. Quantum Dot Superluminescent Diodes for Optical Coherence Tomography: Skin Imaging

      Quantum Dot Superluminescent Diodes for Optical Coherence Tomography: Skin Imaging

      We present a high-power (18 mW continuous wave exiting a single-mode fiber and 35 mW exiting the facet), broadband (85 nm full-width at half-maximum) quantum dot-based superluminescent diode, and apply it to a time-domain optical coherence tomography (OCT) setup. First, we test its performance with increasing optical feedback. Then we demonstrate its imaging properties on tissue-engineered (TE) skin and in vivo skin. OCT allows the tracking of epidermal development in TE skin, while the higher power source allows better sensitivity and depth penetration for imaging of in vivo skin layers.

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    1-3 of 3
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  2. Topics in the News

    1. (3 articles) University of Sheffield
    2. (3 articles) David T. D. Childs
    3. (3 articles) Richard A. Hogg
    4. (2 articles) Steven J. Matcher
    5. (2 articles) Nikola Krstajic
    6. (2 articles) Marco Bonesi
    7. (1 articles) Medical University of Vienna
    8. (1 articles) Kobe University Graduate School of Medicine
    9. (1 articles) Ziyang Zhang
    10. (1 articles) UCSD
    11. (1 articles) Dmitry A. Terpelov
    12. (1 articles) Grigory V. Gelikonov
    13. (1 articles) Laura J. Balcer
    14. (1 articles) Michel Pâques
    15. (1 articles) Felipe A. Medeiros
    16. (1 articles) Valentin M. Gelikonov
    17. (1 articles) Pavel A. Shilyagin
    18. (1 articles) Kate Grieve
    19. (1 articles) Giuseppe Querques
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