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Longitudinal Holograms for Digital Frequency Selection and Electronic Tuning in Terahertz Quantum Cascade Lasers

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Abstract

Terahertz (THz) quantum cascade lasers (QCL) operating round 2.9 THz are modified with longitudinal computer-generated hologram (LCGH) structures <3 mm in total length to achieve purely electronic discrete tuning on six modes spanning over 160 GHz. The behavior and digital frequency selection offered by LCGH QCLs is shown to be reproducible.

© 2012 Optical Society of America

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