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Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Self-Injection Locked and Phase Offset-Free Micromechanical Frequency Combs.

Jiahao Wu¹, Penghui Song², Shuke Zang¹

¹Shanghai Jiao Tong University, University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai 200240, China.

Physical Review Letters

|March 28, 2025

Summary

Researchers developed a self-injection locked micromechanical frequency comb. This innovation overcomes limitations in spectral width and phase offset, enhancing precision timekeeping applications.

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Area of Science:

Nonlinear Dynamics
Precision Metrology
Microelectromechanical Systems (MEMS)

Background:

Mechanical frequency combs show promise for miniatured precision timekeeping.
Current limitations include narrow spectra and lack of frequency locking physics.

Purpose of the Study:

To design and experimentally demonstrate a self-injection locked micromechanical frequency comb.
To achieve intrinsic immunity to phase offset in mechanical frequency combs.

Main Methods:

Utilized a pair of nonlinearly coupled flexural and torsional oscillations.
Tuned the pump frequency to achieve self-injection locking.
Aligned comb teeth from neighboring harmonic clusters.

Main Results:

Achieved decade-wide cascading of hundreds of equidistant teeth.
Demonstrated significant improvement in comb spacing stability and phase noise.
Observed disappearance of phase offset in the temporal signal.

Conclusions:

Self-injection locking in mechanical frequency combs was successfully demonstrated.
The developed comb exhibits zero phase offset, enhancing its value for precision applications.
This work significantly advances the potential of mechanical frequency combs for timekeeping.