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Third-harmonic generation via broadband cascading in disordered quadratic nonlinear media
W Wang1, V Roppo, K Kalinowski
1Nonlinear Physics Center and Laser Physics Center, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200, Australia.
Optics Express
|December 10, 2009
Summary
Disordered ferroelectric domains enable broadband third-harmonic generation in nonlinear media. This occurs through cascading second-order nonlinear processes, confirmed by spatial and polarization analysis.
Area of Science:
- Nonlinear optics
- Materials science
Background:
- Parametric frequency conversion is crucial for generating new frequencies of light.
- Quadratic nonlinear media with ordered ferroelectric domains are typically used for efficient frequency conversion.
- Disorder in these domains has been considered a limitation for nonlinear optical processes.
Purpose of the Study:
- To investigate the potential of disordered ferroelectric domains for parametric frequency conversion.
- To demonstrate broadband third-harmonic generation (THG) in such media.
- To analyze the spatial and polarization characteristics of the generated radiation.
Main Methods:
- Theoretical analysis of nonlinear optical processes in disordered media.
- Numerical simulations of third-harmonic generation.
- Experimental validation of theoretical predictions.
Main Results:
- Disorder in ferroelectric domains enables broadband third-harmonic generation.
- This broadband THG is achieved via cascading of two second-order quasi-phase matched nonlinear processes.
- Spatial and polarization properties of the emitted radiation align with theoretical models.
Conclusions:
- Disordered ferroelectric domains are a viable platform for broadband nonlinear frequency conversion.
- Cascading second-order nonlinear processes in disordered media offer new avenues for light generation.
- The findings provide a foundation for designing novel nonlinear optical devices.
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