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Multistep cascading in periodically poled directional couplers.
Kaloyan Koynov1, Solomon M Saltiel, Yuri S Kivshar
1Faculty of Physics, University of Sofia, 5 J. Bourchier Boulevard, 1164-Sofia, Bulgaria.
Optics Letters
|September 30, 2005
Summary
We propose a new method for multistep parametric processes using a nonlinear directional coupler. This scheme enables efficient wavelength conversion from the third optical communication window to visible light.
Area of Science:
- Nonlinear optics
- Waveguide optics
- Quantum optics
Background:
- Parametric processes are crucial for wavelength conversion.
- Cascaded nonlinear processes offer enhanced efficiency.
- Periodically poled materials enable tailored nonlinear interactions.
Purpose of the Study:
- To propose a novel scheme for multistep cascaded parametric processes.
- To derive conditions for simultaneous phase matching in nonlinear optical devices.
- To achieve efficient wavelength conversion in LiNbO3 waveguide couplers.
Main Methods:
- Utilizing a periodically poled nonlinear directional coupler.
- Deriving simultaneous phase-matching conditions for second-harmonic generation and sum-frequency mixing.
- Analyzing cascaded third-harmonic generation for wavelength conversion.
Main Results:
- Successful derivation of conditions for simultaneous phase matching.
- Prediction of efficient wavelength conversion.
- Demonstration of conversion from the third optical communication window (1.53-1.56 µm) to visible light.
Conclusions:
- The proposed scheme provides an efficient method for multistep cascaded parametric processes.
- LiNbO3 poled waveguide couplers are suitable for efficient wavelength conversion.
- This research contributes to advancements in optical communication and visible light generation.