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 language | English |
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Pages (from-to) | 39793-39803 |
Number of pages | 11 |
Journal | Optics Express |
Volume | 32 |
Issue number | 22 |
Early online date | 17 Oct 2024 |
DOIs | |
Publication status | Published - 21 Oct 2024 |
Bibliographical note
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