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Schilt, Stephane

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Schilt, Stephane
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https://libra.unine.ch/handle/123456789/492

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  • Publication
    Accès libre
    Frequency Tuning and Modulation of a Quantum Cascade Laser with an Integrated Resistive Heater
    Gürel, Kutan
    ;
    Schilt, Stephane 
    ;
    Bismuto, Alfredo
    ;
    Bidaux, Yves
    ;
    Tardy, Camille
    ;
    Blaser, Stéphane
    ;
    Gresch, Tobias
    ;
    Südmeyer, Thomas 
    We present a detailed experimental investigation of the use of a novel actuator for frequency tuning and modulation in a quantum cascade laser (QCL) based on a resistive integrated heater (IH) placed close to the active region. This new actuator is attractive for molecular spectroscopy applications as it enables fast tuning of the QCL wavelength with a minor influence on the optical output power, and is electrically-controlled. Using a spectroscopic setup comprising a low-pressure gas cell, we measured the tuning and modulation properties of a QCL emitting at 7.8 μm as a function of the active region and IH currents. We show that a current step applied to the IH enables the laser frequency to be switched by 500 MHz in a few milliseconds, as fast as for a step of the current in the active region, and limited by heat dissipation towards the laser sub-mount. The QCL optical frequency can be modulated up to ∼100 kHz with the IH current, which is one order of magnitude slower than for the QCL current, but sufficient for many spectroscopic applications. We discuss the experimental results using a thermal model of the heat transfer in terms of cascaded low-pass filters and extract the respective cut-off frequencies. Finally, we present a proof-of-principle experiment of wavelength modulation spectroscopy of a N2O transition performed with a modulation of the IH current and show some potential benefits in comparison to QCL current modulation, which results from the reduced associated amplitude modulation.