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Broadband mid-infrared generation by difference-frequency generation in strongly dispersive Bragg reflection waveguides

J. Appl. Phys. 106, 093101 (2009); doi:10.1063/1.3247072

Published 2 November 2009

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Ritwick Das1 and K. Thyagarajan2
1Carrer de la Coruna, 13, Mediterranean Technology Park, Av. Canal Olimpic s/n, 08860 Castelldefels, Barcelona, Spain
2Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
We present a novel scheme for generation of broadband mid-infrared (mid-IR) radiation using a quasiphase-matched difference-frequency-generation (DFG) process in a planar high index core symmetric Bragg reflection waveguide (BRW) geometry based on GaN/AlxGa1−xN system. By suitably tailoring the dispersion properties of the BRW so as to maintain the phase-matching condition over a broad range of pump wavelengths, we show that the pump acceptance bandwidth could be enhanced by nine to ten times for a DFG process. This manifests into a broadband mid-IR difference-frequency idler with greater than 280 nm bandwidth close to 4.35  µm wavelength. Since the design presented here exploits the dispersive features of the BRW; we can shift the broadband characteristics to any desired region of the mid-IR spectrum within the constraints imposed by transparency and nonlinearity of the constituent materials. The design also facilitates pumping by standard high-power solid-state laser sources. ©2009 American Institute of Physics
History: Received 3 August 2009; accepted 11 September 2009; published 2 November 2009
Permalink: http://link.aip.org/link/?JAPIAU/106/093101/1
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0021-8979 (print)   1089-7550 (online)
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