Mathieu Bertrand


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Bertrand

First Name

Mathieu

ORCID

0000-0001-9016-8103

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2016 - 201952020 - 2026103
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Publications1 - 10 of 108
  • Photonic simulator in synthetic space with fast-gain dynamics
    Item type: Other Conference Item
    Dikopoltsev, Alex; Heckelmann, Ina; Bertrand, Mathieu; et al. (2024)
  • Fast and compact absorption spectroscopy enabled by Quantum Walk Combs
    Item type: Conference Paper
    Heckelmann, Ina; Pinto, Davide; Schmitt, Uwe; et al. (2025)
  • Strongly RF-Modulated Quantum Cascade Lasers: Making Broad and Stable Emitters
    Item type: Other Conference Item
    Cargioli, Alessio; Piciocchi, Diego; Bertrand, Mathieu; et al. (2024)
  • Dynamics of liquid light in the synthetic space of a fast-gain laser
    Item type: Other Conference Item
    Heckelmann, Ina; Dikopoltsev, Alex; Piciocchi, Diego; et al. (2025)
  • Manipulation of liquid light in fast-gain frequency-comb lasers
    Item type: Other Conference Item
    Dikopoltsev, Alex; Heckelmann, Ina; Piciocchi, Diego; et al. (2024)
    10th Workshop on the Physics and Technology of Semiconductor Lasers: Book of Abstracts
  • Coherent walk and lock in driven fast-gain frequency-combs
    Item type: Other Conference Item
    Heckelmann, Ina; Bertrand, Mathieu; Dikopoltsev, Alex; et al. (2023)
    EPJ Web of Conferences ~ EOS Annual Meeting (EOSAM 2023)
    Locking multiple modes into a frequency comb is key for multiple metrological applications, and a great effort has been therefore invested in this challenge over the last decade. The most common techniques are based on either nonlinearities or modulation of the cavity, while the latter is considered the more controllable method to produce frequency combs. The modulation couples cavity modes and creates a lattice in a synthetic dimension with coherent walk dynamics, but typically these dynamics are overthrown by the dissipative processes, leading to a spectrum that is narrow relatively to the full frequency ladder potential. Here we propose and demonstrate that by using fast-gain we preserve the full potential of the coherent walk and lock the frequency comb at its maximum possible bandwidth. Moreover, we find in our system a unique regime of dissipative fast-gain Bloch oscillations. We demonstrate these dynamics in RF-modulated quantum cascade laser ring devices.
  • Mid-infrared femtosecond pulses from a quantum cascade laser
    Item type: Conference Paper
    Täschler, Philipp; Bertrand, Mathieu; Schneider, Barbara; et al. (2022)
    Proceedings of SPIE ~ Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXII
    In recent years, quantum cascade lasers have matured to become compact, powerful sources of coherent mid infrared light. Yet, the ultrafast carrier dynamics in these sources has so far restricted the formation of high intensity ultrashort pulses. In this work, we demonstrate the formation of ~ 630 fs QCL pulses with a peak power of ~ 4.3 W. We break the picosecond barrier in an approach similar to chirped pulse amplification, where we externally recompress the maximally chirped output of a quantum cascade laser frequency comb. Ultrashort pulse formation is confirmed with a novel asynchronous optical sampling technique. These results emphasise the potential of quantum cascade lasers also as sources for non-linear experiments in the mid-infrared.
  • Towards the mid-infrared equivalent of a VCSEL
    Item type: Other Conference Item
    Stark, David; Kapsalidis, Filippos; Markmann, Sergej; et al. (2024)
    Proceedings of SPIE ~ Novel In-Plane Semiconductor Lasers XXIII
  • Strongly modulated QCLs as broadband Mid-IR sources
    Item type: Conference Poster
    Cargioli, Alessio; Bertrand, Mathieu; Hakobyan, Sargis; et al. (2023)
  • Fast Fourier transform spectroscopy with broadband strongly modulated quantum cascade lasers
    Item type: Journal Article
    Cargioli, Alessio; Piciocchi, Diego; Bertrand, Mathieu; et al. (2024)
    Applied Physics Letters
    The combination of speed and resolution is a fundamental figure of merit for Fourier transform spectroscopy. Here, we show that, by combining a fast rotational delay line with a strongly modulated quantum cascade laser (QCL), it is possible to perform broadband spectroscopy over a range of 175 cm−1, with a total effective integration time of about 6 s and a resolution of 0.03 cm−1. Remarkably, even though the resolution of the measurement is limited by the source, the interleaving technique can still be applied when the QCL is not in a frequency comb regime, considerably broadening the bandwidth of the instrument.
Publications1 - 10 of 108