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NATO science for peace and security series. B, Physics and biophysics

Anisotropic Medium Approach for the Optical Nonlinearities of Dilute Nitride Superlattices

Chijioke I. Oriaku, Tim J. Spencer, Mauro Fernandes Pereira

Published Jan 1, 2017• 3 citations
Publisher
DOI
10.1007/978-94-024-1093-8_14

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Quasi-phase-matched parametric downconversion via cascaded optical nonlinearities in an aperiodically poled MgO:LiNbO3 superlattice was studied in theory and experiment. Due to the cascading effect and the abundant reciprocal structure in an aperiodic optical superlattice, multiple-wavelength parametric downconversion in a wide spectrum range can be obtained. Enhancement of the conversion efficiency and output stability through coupling of two nonlinear processes is demonstrated. The result also reveals that the cascaded parametric downconversion process can be used to efficiently downconvert the fundamental wavelength to a longer wavelength of the infrared region. The process can be additionally served as an efficient mechanism to enhance THz wave propagation in a nonlinear optical medium.