Off-Normal Incidence Coupling for Perfectly Phase-Matched Second Harmonic Generation in a Sub-Micron LiNbO3 Planar Waveguide

An angular coupling configuration is shown to facilitate phase-matched second harmonic generation between the TE 1 fundamental and TE 4 second harmonic modes of a LiNbO 3 planar waveguide. For an incident coupling angle of 10°, 2.6% coupling efficiency is achieved for the TE 1 waveguide mode, thus p...

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Published in:Journal of lightwave technology 2020-08, Vol.38 (15), p.3959-3964
Main Authors: Carnio, Brett N., Elezzabi, Abdulhakem Y.
Format: Article
Language:English
Subjects:
Coupling
Couplings
Energy conversion efficiency
Frequency conversion
Harmonic analysis
light sources
lithium compounds
Lithium niobate
Lithium niobates
nonlinear optics
Optical communication
Optical coupling
Optical waveguides
Phase matching
Planar waveguides
Quantum computing
Second harmonic generation
Waveguide lasers
waveguides
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Elezzabi, Abdulhakem Y.
description An angular coupling configuration is shown to facilitate phase-matched second harmonic generation between the TE 1 fundamental and TE 4 second harmonic modes of a LiNbO 3 planar waveguide. For an incident coupling angle of 10°, 2.6% coupling efficiency is achieved for the TE 1 waveguide mode, thus permitting visible light generation at the wavelength of 402.4 nm through phase-matching to the TE 4 second harmonic mode. For a 2.8 mm-long LiNbO 3 planar waveguide excited at an energy of 1.8 nJ, the second harmonic generation conversion efficiency is 4.6 × 10 −5 . The ability of this angular coupling scheme to facilitate phase-matched frequency-conversion makes it ideal for use in optical computing, optical communications, and quantum computing.
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source IEEE Electronic Library (IEL) Journals
subjects Coupling
Couplings
Energy conversion efficiency
Frequency conversion
Harmonic analysis
light sources
lithium compounds
Lithium niobate
Lithium niobates
nonlinear optics
Optical communication
Optical coupling
Optical waveguides
Phase matching
Planar waveguides
Quantum computing
Second harmonic generation
Waveguide lasers
waveguides
title Off-Normal Incidence Coupling for Perfectly Phase-Matched Second Harmonic Generation in a Sub-Micron LiNbO3 Planar Waveguide
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