Quasi phase matching in GaAs–AlAs superlattice waveguides through bandgap tuning by use of quantum-well intermixing
2000; Optica Publishing Group; Volume: 25; Issue: 18 Linguagem: Inglês
10.1364/ol.25.001370
ISSN1539-4794
AutoresAmr S. Helmy, D. C. Hutchings, T.C. Kleckner, J.H. Marsh, A.C. Bryce, John M. Arnold, C.R. Stanley, J. S. Aitchison, C. T. A. Brown, Konstantinos Moutzouris, M. Ebrahim-Zadeh,
Tópico(s)Advanced Fiber Laser Technologies
ResumoWe report the observation of second-harmonic generation by type I quasi phase matching in a GaAs-AlAs superlattice waveguide. Quasi phase matching was achieved through modulation of the nonlinear coefficient chi((2))(zxy), which we realized by periodically tuning the superlattice bandgap. Second-harmonic generation was demonstrated for fundamental wavelengths from 1480 to 1520 nm, from the third-order gratings with periods from 10.5 to 12.4microm . The second-harmonic signal spectra demonstrated narrowing owing to the finite bandwidth of the quasi-phase-matching grating. An average power of ~110 nW was obtained for the second harmonic by use of an average launched pump power of ?2.3mW .
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