A Novel Scheme for Hundred-Hertz Linewidth Measurements with the Self-Heterodyne Method

作者：Peng Yu^*

来源：Chinese Physics Letters, 2013, 30(8): 084208.

DOI：10.1088/0256-307X/30/8/084208

We propose a novel scheme to accurately determine the hundred-hertz linewidth using the delayed self-heterodyne method, in which the delay time is far less than the coherence time of the laser. This exceeds the former understanding of the delayed self-heterodyne technique, which requires a prohibitively long fiber. The self-heterodyne autocorrelation function and power spectrum are evaluated, and by numerical analysis we ensure that -3 dB of the power spectrum is applied to the self-heterodyne linewidth measurements. For a laser linewidth of less than 100 Hz, the linewidth can be measured directly by a 10 km fiber, and in a more general case, the linewidth can be deduced from -20 dB or -40 dB of the fitting Lorentzian curve.

• 出版日期2013-8
• 单位北京理工大学