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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Optical frequency combs generated mechanically.

|August 16, 2017

Summary

This summary is machine-generated.

Researchers developed a novel optical frequency comb using an elongated bottle microresonator. This device generates highly equidistant optical frequencies, driven by acoustic modes, independent of laser power or vibrations.

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Area of Science:

Photonics
Acoustic-Optics
Micro-optics

Background:

Microresonators are crucial for nonlinear optics.
Generating stable, equidistant optical frequency combs is a key challenge.

Purpose of the Study:

To investigate the parametric excitation of optical modes in a microresonator by acoustic modes.
To demonstrate a novel method for generating highly equidistant optical frequency combs.

Main Methods:

Utilizing an elongated bottle microresonator with nanoscale parabolic effective radius variation.
Exploiting the coupling between optical eigenfrequencies and axially symmetric acoustic modes.
Parametric excitation of optical modes via the acoustic mode.

Main Results:

Observed a series of dense, equally spaced optical eigenfrequencies.
Achieved parametric excitation of optical modes by the acoustic mode.
Generated a highly equidistant and moderately broadband optical frequency comb.
Demonstrated that comb teeth spacing is independent of input laser power and mechanical vibration amplitude.

Conclusions:

Elongated bottle microresonators with specific geometry can support acoustic-optically driven frequency combs.
This method offers a robust way to generate stable optical frequency combs.
The independence from external parameters suggests practical applications in metrology and communications.