Characterization of heterodyne optical phase locking for relative laser frequency noise suppression in differential measurement

A. Kulur Ramamohan*, S. S.Y. Chua, Y. Zhang, M. J. Yap, J. Wright, N. A. Holland, P. W.F. Forsyth, B. J.J. Slagmolen

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Laser frequency noise is particularly challenging to mitigate in low Fourier frequency measurement. For differential measurement schemes using heterodyne optical phase-locked loops, this noise can be common-mode suppressed in the final readout while maintaining a flexible frequency offset and a large frequency-shift dynamic range. We demonstrate simultaneous optical phase-locked loops using digital servo systems, with up to 300 MHz offset frequency range, 250 dB open-loop gain at 0.1 Hz, and control timescales suitable for low-frequency measurement. We also detail a four-laser differential measurement intended for use in a precision measurement device that uses_ optical phase-locked loops, suppressing relative free-running noise to reach below 0.1 Hz/Hz at 0.1 Hz in the measurement readout.

Original languageEnglish
Pages (from-to)39793-39803
Number of pages11
JournalOptics Express
Volume32
Issue number22
Early online date17 Oct 2024
DOIs
Publication statusPublished - 21 Oct 2024

Bibliographical note

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© 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

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