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Waveguide design optimization for a quantum cascade laser emitting at 77 μm

✍ Scribed by Vinod M Menon; W.D Goodhue; A.S Karakashian; L.R Ram-Mohan

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
248 KB
Volume
7
Category
Article
ISSN
1386-9477

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✦ Synopsis

The dependence of waveguide design parameters on the performance of a GaAs=AlGaAs quantum cascade laser emitting at 77 m is theoretically evaluated. We propose a new waveguiding scheme for modal conÿnement at such long wavelengths. An artiÿcially tailored index layer and a plasmon enhanced layer act as the cladding at the top and bottom of the active region, respectively. The cladding layers have been made aluminum free to avoid the presence of DX centers. The waveguide design is optimized to enhance modal conÿnement and reduce waveguide losses. Finally, we present an optimized design of the quantum cascade laser in its entirety along with expected performance characteristics.

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