Hyperparametric solitons in nondegenerate optical parametric oscillators.

Area of Science:

• Nonlinear optics
• Microresonator optics
• Quantum optics

Background:

• Dissipative solitons and optical frequency combs are crucial for applications like optical communications and spectroscopy.
• Existing methods using degenerate optical parametric oscillators (OPOs) lack tunability.
• Nondegenerate OPOs offer enhanced tunability but haven't been fully explored for soliton generation.

Purpose of the Study:

• To demonstrate a proof-of-principle for solitons in a nondegenerate OPO system.
• To investigate hyperparametric solitons in a silicon-nitride microresonator.
• To explore the properties and potential applications of this new soliton family.

Main Methods:

• Utilizing a silicon-nitride microresonator with engineered dispersion and optimized coupling.
• Pumping a low-Q resonance in the C-band to excite signal soliton combs.
• Employing theoretical modeling and experimental investigation.

Main Results:

• Excitation of a signal soliton comb centered in the O-band and repetition-rate-locked combs at pump and idler frequencies (beyond 2 μm).
• Observation of hyperparametric solitons, a distinct class of dissipative solitons.
• Characterization of soliton properties, including parametric background and multisoliton states.

Conclusions:

• The demonstrated nondegenerate OPO system enables the generation of tunable optical frequency combs.
• Hyperparametric solitons represent a novel platform for advanced optical applications.
• This work paves the way for new soliton families with unique spectral properties.