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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Chip-Scale Optomechanical Frequency Comb with a 1-70 GHz Span.

Xirui Gou¹, William Privratsky¹, Wenhan Sun¹

¹Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States.

|December 12, 2025

Summary

This summary is machine-generated.

Researchers developed a record-broadband optomechanical frequency comb using a silicon carbide microdisk. This ultracompact device generates phase-locked harmonics from 1 to 70 GHz, enabling diverse applications.

Keywords:

microdisk optomechanical frequency comb optomechanical oscillator silicon carbide

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Area of Science:

Optomechanics
Nonlinear Optics
Microcavity Devices

Background:

Optomechanical frequency combs link optical and mechanical modes.
Previous combs had limited spectral range due to low mechanical frequencies.

Purpose of the Study:

To achieve a record modulation span in optomechanical frequency combs.
To harness strong optomechanical nonlinearity for broader bandwidth.

Main Methods:

Utilized a 2.5-μm-radius silicon carbide microdisk.
Employed a continuous-wave pump to drive phonon lasing via radiation pressure.
Achieved phase-locking of harmonics.

Main Results:

Demonstrated an optomechanical comb with a 1 to 70 GHz modulation span.
Generated 42 phase-locked harmonics with 1.655 GHz spacing.
Achieved low phase noise (-132 dBc/Hz) and high frequency stability (<10^-7).

Conclusions:

The ultracompact optomechanical comb offers a broad bandwidth and excellent stability.
This platform is suitable for diverse applications in the microwave domain and beyond.