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S Smirnov, B Sturman, E Podivilov

|July 19, 2020

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We predict highly stable frequency comb generation in nonlinear optical microresonators using χ(2) (chi-2) nonlinearity. This new method, distinct from χ(3) (chi-3) systems, utilizes temporal walk-off to create stable, localized solitons.

Area of Science:

Nonlinear optics
Quantum optics
Photonics

Background:

Frequency combs are crucial in modern optics, traditionally generated in χ(3) (chi-3) microresonators.
Transitioning to χ(2) (chi-2) nonlinear optical microresonators offers potential for new functionalities and presents unique challenges.

Purpose of the Study:

To investigate and predict a novel mechanism for highly stable frequency comb generation in χ(2) (chi-2) microresonators.
To explore the unique phenomena arising from the interplay of coupled first and second harmonics (FHs and SHs) and temporal walk-off in χ(2) systems.

Main Methods:

Theoretical investigation of nonlinear optical phenomena in χ(2) microresonators.
Analysis of coupled first and second harmonic generation dynamics.
Characterization of temporal walk-off effects and their influence on comb formation.

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Main Results:

Prediction of walk-off controlled, highly stable comb generation, fundamentally different from χ(3) systems.
Introduction of antiperiodic states and localized coherent antiperiodic steady states (solitons).
Characterization of a new family of antiperiodic solitons and their dependence on pump power and group velocity difference.

Conclusions:

Walk-off is a critical parameter for stable comb generation in χ(2) microresonators.
Antiperiodic solitons represent a new class of localized states with potential applications in optical signal processing and metrology.
The findings open new avenues for designing advanced optical frequency comb sources based on χ(2) nonlinearities.