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Second-harmonic generation and cascaded second-order processes in a counterpropagating quasi-phase-matched device
Applied Optics
|February 28, 2008
Summary
This study analyzes nonlinear coupled-wave equations for quasi-phase-matched devices, showing potential for all-optical switching. A significant phase shift was achieved with lower input intensity and 100% throughput.
Area of Science:
- Nonlinear optics
- Quantum optics
- Photonics
Background:
- Quasi-phase-matched (QPM) devices are crucial for nonlinear optical processes.
- Cascaded second-order processes offer unique nonlinear phase shifts.
- All-optical switching requires efficient and low-intensity nonlinear effects.
Purpose of the Study:
- To analyze numerical solutions for nonlinear coupled-wave equations in counterpropagating QPM devices.
- To investigate the potential of these devices for all-optical switching applications.
- To evaluate the impact of device parameters and nonideal components on performance.
Main Methods:
- Numerical analysis of nonlinear coupled-wave equations.
- Derivation of normalized efficiency for second-harmonic generation.
- Investigation of nonlinear phase shifts from cascaded second-order processes.
- Analysis of metallic mirror effects and phase mismatch compensation.
Main Results:
- A π/2 nonlinear phase shift is achievable with significantly reduced input intensity (42x less than Type I).
- 100% throughput was demonstrated.
- Phase mismatch can compensate for nonideal metallic mirrors.
- Power conservation in the configuration was investigated.
Conclusions:
- Counterpropagating QPM devices show promise for efficient all-optical switching.
- Optimized phase mismatch offers a method to mitigate mirror imperfections.
- The presented nonlinear phase shifts are significant for future photonic device development.
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