EFFECTS OF PLATE THICKNESS AND STACK DISTRIBUTION OF QUASI-PHASE MATCHED MATERIALS ON NONLINEAR FREQUENCY GENERATION

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Authors
  1. Wong, S.K.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
Analytical results indicate that the plate thickness tolerance of the GaAs plates in the stack with respect to the coherent length is not a critical parameter. Rather, proper placement order of the plates of different thicknesses that make up the stack is essential for generating efficient nonlinear conversion; conversion efficiency approaching that from a stack of plates with plate thickness equals exactly to the coherent length can be obtained. In effect, such ordered stacking optimizes the relative phase of the nonlinear process as it propagates down the stack and enhances the conversion efficiency. Furthermore, the analysis shows that random order stacking of plates of different thicknesses produces a large variation in conversion efficiency varying from one random stack to another. This may not be desirable in practice; one would normally prefer to have a process that produces QPM stacks with good and predictable performance. A single-pass 3-wave coupled nonlinear frequency interaction model with temporal and spatial pulse profiles included is used to analyze the behaviors of the nonlinear conversion process in quasi-phase matched (QPM) stack. Second harmonic generation of CO2 laser radiation in GaAs plates is used as an example.
Keywords
Diffusion bonded materials;Quasi-phase matching;Second Harmonic Generation
Report Number
DREV-9517 — Technical Report
Date of publication
01 Dec 1995
Number of Pages
40
DSTKIM No
96-02290
CANDIS No
155099
Format(s):
Document Image stored on Optical Disk;Hardcopy

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