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

: Rösener, B.; Kaspar, S.; Rattunde, M.; Töpper, T.; Manz, C.; Köhler, K.; Ambacher, O.; Wagner, J.


Optics Letters 36 (2011), Nr.18, S.3587-3589
ISSN: 0146-9592
Fraunhofer IAF ()

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 100mW. 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.