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Published July 4, 2022 | Published + Submitted
Journal Article Open

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


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 Hz²/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.

Additional Information

© 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement. Received 16 Mar 2022; accepted 14 Jun 2022; published 27 Jun 2022. The authors acknowledge Q. Yang and Y. Lai for helpful discussions. Funding. Defense Advanced Research Projects Agency (HR001-20-2-0044); Air Force Office of Scientific Research (FA9550-18-1-0353). Data availability. Data underlying the results presented in this paper may be obtained from the authors upon reasonable request. Code that processes oscilloscope data has been released as a Python package (pycosh) and can be found at the Python Package Index website. The authors declare no conflicts of interest.

Attached Files

Published - oe-30-14-25147.pdf

Submitted - 2010.09248.pdf


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August 22, 2023
October 23, 2023