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Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

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Annular symmetry nonlinear frequency converters.

Dror Kasimov, Ady Arie, Emil Winebrand

|June 17, 2009

Summary

Researchers developed a novel 2D nonlinear structure with continuous rotational symmetry for quasi-phase matching. This structure enables simultaneous multi-directional frequency doubling and offers wide phase-mismatch tolerance, advancing nonlinear optics applications.

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Area of Science:

Nonlinear Optics
Materials Science

Background:

Quasi-phase matching (QPM) is crucial for efficient nonlinear optical frequency conversion.
Traditional QPM structures rely on periodic lattices, limiting certain functionalities.

Purpose of the Study:

To introduce and characterize a novel two-dimensional nonlinear structure with continuous rotational symmetry for quasi-phase matching.
To explore its unique phase-matching attributes compared to periodic structures.

Main Methods:

Fabrication of annular symmetry structures in LiNbO(3) and stoichiometric LiTaO(3) using indirect e-beam and electric field poling methods.
Characterization of second harmonic generation (SHG) to evaluate conversion efficiencies and angular/thermal dependencies.

Main Results:

The annular symmetry structure enables simultaneous phase-matched frequency doubling into multiple directions.
Demonstrated significantly wide phase-mismatch tolerance, where power is maintained but direction changes.

Conclusions:

The developed annular symmetry structure offers distinct advantages over periodic QPM structures.
This new design opens possibilities for advanced nonlinear optical devices with enhanced functionalities and robustness.