NDLI: Modeling and Optimization of Quasi-Phase Matching Via Domain-Disordering

Content Provider	IEEE Xplore Digital Library
Author	Wagner, S.J. Al Muhairi, A. Aitchison, J.S. Helmy, A.S.
Copyright Year	1965
Abstract	Second-harmonic generation in a quasi-phase matched waveguide produced using a domain-disordered GaAs-AlAs superlattice is modeled including the effects of group velocity mismatch, nonlinear refraction, two-photon absorption, and linear loss. The model predicts our experimentally observed second-harmonic powers within an order of magnitude. Self-phase modulation and two-photon absorption led to reduced conversion efficiencies of up to 33% at input peak powers >50 W. Group velocity mismatch results in a reduction of 23% in conversion efficiency using estimated group velocities calculated from the measured effective refractive index. The modeling also shows that the conversion efficiency peaks at propagation lengths longer than the pulse walk off length and that duty cycle variations induced shifts in the tuning curves. Group velocity mismatch also increased the conversion bandwidth by ~ 30%. Incomplete modulation of chi⁽²⁾ in disordered regions reduced the output conversion efficiency by up to two orders of magnitude. Grating-assisted phase matching led to a 7% efficiency drop for a Deltan of 0.045 at the second-harmonic and 0.01 at the fundamental. This model serves as a valuable tool to provide insight into the optimization of these devices.
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	424
Ending Page	429
Page Count	6
File Size	328578
File Format	PDF
ISSN	00189197
Volume Number	44
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical waveguides Frequency conversion Nonlinear optics Ultrafast optics Optical harmonic generation Optical superlattices Nonlinear optical devices Optical refraction Optical variables control Optical distortion optical waveguides Integrated optics nonlinear optics optical phase matching
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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