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This research aims to improve optical frequency division systems by reducing noise and complexity using Brillouin lasers.

June 19, 2026Science AdvancesOpen Access

Superefficient optical frequency division referenced to μHz Schawlow-Townes-linewidth quantum noise–limited lasers

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Randomized trial demonstrates microwave synthesis for ultrastable optical frequencies, highlighting improved noise suppression.

This research aims to improve optical frequency division systems by reducing noise and complexity using Brillouin lasers.
Utilized common-cavity bicolor Brillouin lasers as optical references.
Developed a simplified optical frequency comb divider with a division factor of 10.
Achieved broadband synthesis from 5 to 20 gigahertz with rapid tuning.
Produced a 10-gigahertz microwave signal with exceptional phase noise of −65 dBc/Hz at 1 Hz offset.
Achieved −155 dBc/Hz at 10 kHz offset and −172 dBc/Hz at 10 MHz offset.
Redefined noise suppression and division complexity trade-offs in optical frequency division systems.

Hu et al. (2026) studied this question.

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