Abstract
We report spectral linewidth measurements of a distributed-feedback quantum cascade laser (QCL). The free-running QCL beam was mixed with a waveguide isotopic 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 line) and then at a high injection current (beating with the 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.
© 2003 Optical Society of America
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