Simultaneous SHG of orthogonally polarized fundamentals in single QPM crystals
Date
2007
Authors
Johnston, Benjamin F
Saltiel, Solomon M
Withford, Michael
Kivshar, Yuri
Journal Title
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Volume Title
Publisher
SPIE - The International Society for Optical Engineering
Abstract
Fabrication of quasi-phase-matching (QPM) gratings suitable for cascading of two second-order parametric nonlinear processes in a single lithium niobate crystal is being undertaken using a new technique - electric field poling assisted by laser micro-machined topographical electrodes. To date, single period poled gratings with 45.75, and 45.8 μm periods have been fabricated in order to demonstrate second harmonic generation of 1064nm laser light with 1st order type-I and 7th order type-0 QPM simultaneously. The two frequency doubling processes share a common Z polarized second-harmonic wave which allows exchange of energy between the two orthogonally polarized fundamental waves and several second order cascading interactions can be realized. The use of the higher QPM orders (3rd, 5th or7th) for the type-0 second harmonic generation process leads to comparable efficiencies of the two processes, as the respective nonlinear coefficients are dzzz ∼27 pm/V and dyyz ∼4.7 pm/V in lithium niobate crystals. Possible applications include; polarization switching, parametric amplification and polarization mode dispersion monitoring, and polarization insensitive second harmonic generation.
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Keywords
Keywords: Electric field effects; Electrodes; Harmonic generation; Light polarization; Micromachining; Nonlinear optics; Phase matching; Single crystals; Laser micromachining; Lithium niobate; Nonlinear coefficient; Quasi phase matching (QPM); Diffraction gratings Laser micromachining; Nonlinear optics; PPLN; QPM
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Source
Proceedings Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VI
Type
Conference paper
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2037-12-31
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