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Opt Lett. 2011 Sep 15;36(18):3587-9. doi: 10.1364/OL.36.003587.

2 μm semiconductor disk laser with a heterodyne linewidth below 10 kHz.

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Fraunhofer-Institut für Angewandte Festkörperphysik, Freiburg, Germany.


We demonstrate a 2 μm semiconductor disk laser emitting in a single longitudinal mode with a linewidth in the <10 kHz range. A heterodyne detection scheme was used for precise linewidth measurements. In these experiments, the output beams of two identical laser cavities were superposed in order to generate a beat note signal on a photodiode. In the absence of active frequency stabilization, a linewidth of 45 kHz was measured at an output power of 100 mW. When using a frequency stabilization consisting of a feedback loop with a Fabry-Perot interferometer as wavelength reference, the linewidth could be further reduced to 9 kHz.

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