Abstract
We demonstrate a semiconductor disk laser emitting in a single longitudinal mode with a linewidth in the 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 was measured at an output power of . 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 .
© 2011 Optical Society of America
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