Faculté des sciences
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High-temperature operation of distributed feedback quantum-cascade lasers at 5.3 µm

Hofstetter, Daniel ; Beck, Mattias ; Aellen, Thierry ; Faist, Jérôme

In: Applied Physics Letters, 2001, vol. 78, p. 396-398

High-temperature operation of a low-threshold 5.3 µm quantum-cascade distributed feedback laser is presented. The emission spectrum was single mode with more than 20 dB side mode suppression ratio for all investigated temperatures and up to thermal rollover. For 1.5% duty cycle and at 0 °C, the laser emitted 1.15 W of single mode peak power; at 120 °C, a value of 92 mW was seen. For a 3... More

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    Title
    • High-temperature operation of distributed feedback quantum-cascade lasers at 5.3 µm
    Author
    • Hofstetter, Daniel. Institut de Physique, Université de Neuchâtel, Switzerland
    • Beck, Mattias. Institut de Physique, Université de Neuchâtel, Switzerland
    • Aellen, Thierry. Institut de Physique, Université de Neuchâtel, Switzerland
    • Faist, Jérôme. Institut de Physique, Université de Neuchâtel, Switzerland
    Document Type
    • Postprint
    Publication Date
    • 2001
    Language
    • English
    Published in
    • Applied Physics Letters, 2001, vol. 78, p. 396-398. American Institute of Physics (AIP)
    Other Version
    Classification
    • Physics
    OAI-PMH Identifier
    • oai:doc.rero.ch:20080509103102-GT
    Submission No.
    • 20080509103102-GT
    Summary
    High-temperature operation of a low-threshold 5.3 µm quantum-cascade distributed feedback laser is presented. The emission spectrum was single mode with more than 20 dB side mode suppression ratio for all investigated temperatures and up to thermal rollover. For 1.5% duty cycle and at 0 °C, the laser emitted 1.15 W of single mode peak power; at 120 °C, a value of 92 mW was seen. For a 3 mm long device, we observed a room-temperature threshold current density of 3.6 kA/cm2. This remarkable performance is mainly due to a 4 quantum-well active region using a double phonon resonance for the lower laser level.