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Enhanced Čerenkov second-harmonic emission in nonlinear photonic structures.
K Kalinowski1, P Roedig, Y Sheng
1Laser Physics Center and Nonlinear Physics Center, Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia. xkk124@physics.anu.edu.au
Optics Letters
|June 5, 2012
Summary
We enhanced second-harmonic generation power by 270 times in nonlinear photonic crystals. This was achieved by optimizing the angle of incidence to compensate for phase mismatch, enabling nonlinear Bragg diffraction.
Area of Science:
- Nonlinear optics
- Photonics
- Condensed matter physics
Background:
- Čerenkov-type second-harmonic generation (SHG) is a key process in nonlinear optics.
- Controlling phase matching is crucial for efficient SHG.
- One-dimensional nonlinear photonic crystals offer unique properties for light manipulation.
Purpose of the Study:
- To experimentally and theoretically investigate Čerenkov-type SHG in a 1D nonlinear photonic crystal.
- To demonstrate significant enhancement of second-harmonic power.
- To explore the role of reciprocal lattice vectors in phase-matching and nonlinear interactions.
Main Methods:
- Experimental setup for Čerenkov-type SHG measurements.
- Theoretical modeling of nonlinear optical processes in photonic crystals.
- Varying the angle of incidence of the fundamental beam.
- Utilizing the reciprocal lattice vector for phase compensation.
Main Results:
- Achieved a 270-fold enhancement in emitted second-harmonic power.
- Demonstrated effective phase mismatch compensation in the transverse direction.
- Operated in the nonlinear Bragg diffraction regime.
Conclusions:
- The angle of incidence is a critical parameter for optimizing SHG in nonlinear photonic crystals.
- Reciprocal lattice vector-assisted phase matching enables efficient nonlinear interactions.
- Nonlinear Bragg diffraction provides a powerful mechanism for enhanced light conversion.
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