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Wideband multimode optical parametric oscillation in a Kerr microresonator
Optics Express
|February 24, 2023
Summary
This study demonstrates a new method for generating optical frequencies using multimode parametric oscillation in Kerr microresonators. This technique relaxes phase-matching conditions, enabling broader frequency generation in compact devices.
Area of Science:
- Nonlinear optics
- Quantum optics
- Microresonator devices
Background:
- Parametric oscillation in Kerr microresonators generates new optical frequencies.
- Phase-matching requirements for four-wave mixing (FWM) limit output frequency ranges.
- Strong dispersion in resonators restricts viable pump wavelengths.
Purpose of the Study:
- To investigate multimode FWM for relaxed phase-matching conditions.
- To enable generation of large frequency shift parametric sidebands.
- To demonstrate this in a practical microresonator system.
Main Methods:
- Utilizing a multimode FWM process where pump and sidebands occupy different mode families.
- Employing a magnesium-fluoride micro-disk resonator.
- Experimentally accessing different pump and sideband modes.
Main Results:
- Achieved significant relaxation in phase-matching requirements.
- Generated large frequency shift parametric sidebands even with strong second-order dispersion.
- Demonstrated four distinct multimode parametric processes with frequency shifts from 118 to 216 THz.
- Observed a sideband separation of almost three octaves.
Conclusions:
- Multimode FWM offers a flexible approach to optical frequency generation in microresonators.
- This method broadens the accessible output frequencies and relaxes design constraints.
- The demonstrated technique is promising for low-power, compact frequency conversion devices.
