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Published on: November 30, 2012
Broadband frequency tripling in locally ordered nonlinear photonic crystal
Yan Sheng1, Wieslaw Krolikowski
1Laser Physics Center, Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia. ysh111@physics.anu.edu.au
Optics Express
|March 14, 2013
Summary
Researchers created a lithium niobate (LiNbO₃) photonic crystal for efficient frequency tripling. This nonlinear crystal achieved up to 15% energy conversion efficiency for broadband light sources.
Area of Science:
- Materials Science
- Photonics
- Nonlinear Optics
Background:
- Lithium niobate (LiNbO₃) is a key material in nonlinear optics.
- Achieving broadband high frequency conversion efficiency in photonic crystals remains a challenge.
- Locally ordered ferroelectric domains offer a route to engineer nonlinear optical properties.
Purpose of the Study:
- To propose and fabricate a novel LiNbO₃-based nonlinear photonic crystal.
- To demonstrate broadband high frequency conversion efficiency using engineered nonlinearity.
- To achieve efficient frequency tripling via cascading in the infrared spectrum.
Main Methods:
- Fabrication of a LiNbO₃-based nonlinear photonic crystal with locally ordered ferroelectric domains.
- Utilizing nonlinearity modulation to create uniformly distributed reciprocal lattice vectors.
- Experimental demonstration of broadband frequency tripling via cascading.
Main Results:
- The fabricated LiNbO₃ photonic crystal exhibits locally ordered ferroelectric domains.
- Nonlinearity modulation successfully generated sets of uniformly distributed reciprocal lattice vectors.
- Broadband frequency tripling was achieved for wavelengths ranging from 1400 to 1830 nm.
- Maximum energy conversion efficiency reached approximately 15%.
Conclusions:
- The proposed LiNbO₃-based nonlinear photonic crystal enables broadband high frequency conversion efficiency.
- Locally ordered ferroelectric domains are effective for engineering photonic crystal properties.
- The demonstrated frequency tripling showcases the potential for efficient nonlinear optical signal processing.
