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arxiv: 2010.09248 · v2 · pith:R67FDE3Anew · submitted 2020-10-19 · ⚛️ physics.optics · physics.ins-det

Correlated self-heterodyne method for ultra-low-noise laser linewidth measurements

Zhiquan Yuan , Heming Wang , Peng Liu , Bohan Li , Boqiang Shen , Maodong Gao , Lin Chang , Warren Jin
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Avi Feshali Mario Paniccia John Bowers Kerry Vahala
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classification ⚛️ physics.optics physics.ins-det
keywords frequencylasersnoisecorrelatedmeasurementsmethodself-heterodyneacquisition
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Narrow-linewidth lasers are important to many applications spanning precision metrology to sensing systems. Characterization of these lasers requires precise measurements of their frequency noise spectra. Here we demonstrate a correlated self-heterodyne (COSH) method capable of measuring frequency noise as low as 0.01 Hz$^2$/Hz at 1 MHz offset frequency. The measurement setup is characterized by both commercial and lab-built lasers, and features low optical power requirements, fast acquisition time and high intensity noise rejection.

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