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Abstract: Antireflection Coating for External-Cavity Quantum Cascade Laser Near 5 THz

D.B. Fenner, J.M. Hensley, M.G. Allen, J. Xu, A. Tredicucci, "Antireflection Coating for External-Cavity Quantum Cascade Laser Near 5 THz ," presented at Materials Research Society 2007 Spring Meeting (San Francisco, CA) Mater. Res. Soc. Siymp. Proc. , edited by S. Grego, J.M. Ramsey, O. Velev, S. Verpoorte, , Materials and Material Structures Enabling Therahertz Technology 1004E (Paper 1016-CC07-03) (9-13 April2007).

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Abstract

We report a simple and practical method to design and fabricate antireflection (AR) coatings for the emission facet of GaAs-based laser chips suited to operating in the very far infrared (IR) or terahertz (THz) spectral region. Vacuum-deposited silica films about 8 µm thick serve as a single layer, quarter-wave AR and with reflectivities measured below 0.5% over ~10 cm-1 range in the far IR. Quantum cascade lasers (QCL) thus coated function well at 8-10 K coupled to a tunable, external cavity optical system at ~158 cm-1 (~4.75 THz).

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