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

  • David B. Fenner (a1), Joel M. Hensley (a2), Mark G. Allen (a3), Jihua Xu (a4) and Alessandro Tredicucci (a4)...

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 Ým 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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