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Free-running 9.1-<i>μ</i>m distributed-feedback quantum cascade laser linewidth measurement by heterodyning with a C<sup>18</sup>O<sub>2</sub> laser
Auteur(s)
Weidmann, D.
Joly, L.
Parpillon, V.
Courtois, D.
Bonetti, Yargo
Aellen, Thierry
Beck, Mattias
Faist, Jérôme
Date de parution
2003
In
Optics Letters, Optical Society of America, 2003/28/9/704-706
Résumé
We report spectral linewidth measurements of a 9.1-<i>μ</i>m distributed-feedback quantum cascade laser (QCL). The free-running QCL beam was mixed with a waveguide isotopic C<sup>18</sup>O<sub>2</sub> laser onto a high-speed HgCdTe photomixer, and beat notes were recorded from a radio-frequency spectral analyzer. Beating was performed at two operating conditions, first near the QCL laser threshold (beating with the C<sup>18</sup>O<sub>2</sub><i>R</i>10 line) and then at a high injection current (beating with the C<sup>18</sup>O<sub>2</sub><i>R</i>8 line). Overall, beat note widths of 1.3–6.5 MHz were observed, which proves that a free-running QCL can have a short-term spectral width near 1 MHz.
Identifiants
Type de publication
journal article
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