Free-running 91-µm distributed-feedback quantum cascade laser linewidth measurement by heterodyning with a C^18O_2 laser
2003; Optica Publishing Group; Volume: 28; Issue: 9 Linguagem: Inglês
10.1364/ol.28.000704
ISSN1539-4794
AutoresDamien Weidmann, L. Joly, V. Parpillon, D. Courtois, Y. Bonetti, T. Aellen, Mattias Beck, Jérôme Faist, Daniel Hofstetter,
Tópico(s)Laser Design and Applications
ResumoWe report spectral linewidth measurements of a 9.1-microm distributed-feedback quantum cascade laser (QCL). The free-running QCL beam was mixed with a waveguide isotopic C18O2 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 C18O2 R10 line) and then at a high injection current (beating with the C18O2 R8 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.
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