Frequency noise measurements using coherent self-heterodyne detection

Simon Thorndahl Thomsen*, Mónica Far Brusatori, Niklas Hedegaard Arent, Rakesh Ranjan Kumar, Nicolas Volet

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperLetterpeer-review


We demonstrate a refined way to extract the frequency noise (FN) spectrum of lasers by tailoring the delay in a conventional delayed self-heterodyne setup to sub-coherence lengths. The method achieves direct proportionality between electrical spectrum analyzer traces and the FN spectrum, which provide the intrinsic linewidth of the lasers. This proposed method is validated by comparing the FN spectrum with that obtained from a commercial frequency noise analyzer. The method provides a cost-effective alternative for FN measurements, which also requires minimal post-processing as compared to the state-of-the-art.

Original languageEnglish
JournalOptics Letters
Pages (from-to)6372-6375
Number of pages4
Publication statusPublished - Dec 2023


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