Fraunhofer-Institut für Angewandte Festkörperphysik, Freiburg, Germany.
Opt Lett. 2011 Sep 15;36(18):3587-9. doi: 10.1364/OL.36.003587.
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.
我们展示了一种 2μm 半导体盘片激光器，它在单一纵模下发射，线宽在 10kHz 范围内。采用外差探测方案进行精确的线宽测量。在这些实验中，两个相同的激光腔的输出光束在光电二极管上产生拍频信号。在没有主动频率稳定的情况下，在 100mW 的输出功率下测量到 45kHz 的线宽。当使用由带有法布里-珀罗干涉仪的反馈环作为波长参考的频率稳定化装置时，线宽可以进一步降低到 9kHz。
