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Frequency noise measurements using coherent self-heterodyne detection

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Abstract

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.

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Supplementary Material (1)

NameDescription
Supplement 1       A derivation of the main result of the article

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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