Abstract

We demonstrate a 2μm semiconductor disk laser emitting in a single longitudinal mode with a linewidth in the <10kHz 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 45kHz 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 9kHz.

© 2011 Optical Society of America

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