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Third-harmonic generation via nonlinear Raman-Nath diffraction in nonlinear photonic crystal
Yan Sheng1, Wenjie Wang, Roy Shiloh
1Laser Physics Center, Research School of Physics and Engineering, Australian National University, ACT 0200, Australia. ysh111@physics.anu.edu.au
Optics Letters
|August 18, 2011
Summary
Researchers observed third-harmonic conical waves in a nonlinear photonic crystal. This phenomenon arises from cascading parametric processes, marking the first observation of third-harmonic generation via nonlinear Raman-Nath diffraction.
Area of Science:
- Nonlinear optics
- Photonics
Background:
- Periodically poled nonlinear photonic crystals enable efficient nonlinear optical processes.
- Third-harmonic generation (THG) is a key nonlinear optical effect.
Purpose of the Study:
- To experimentally observe and analyze third-harmonic conical waves.
- To investigate the underlying nonlinear optical mechanisms responsible for their formation.
Main Methods:
- Utilizing an annular periodically poled nonlinear photonic crystal.
- Analyzing the generated conical beams and their properties.
Main Results:
- Observation of multiple third-harmonic conical waves.
- Demonstration that conical beams result from cascading parametric processes.
- Confirmation of transverse and/or longitudinal phase-patching conditions.
Conclusions:
- First experimental observation of THG based on nonlinear Raman-Nath diffraction.
- The study elucidates the formation mechanism of conical beams in nonlinear photonic crystals.
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