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Title: Electrical laser frequency tuning by three terminal terahertz quantum cascade lasers

Electrical laser emission frequency tuning of a three terminal THz quantum cascade laser is demonstrated. A high electron mobility transistor structure is used in a surface plasmon waveguide to modulate the electron density in a channel, controlling the effective refractive index of the waveguide. The threshold current density was modulated by 28% via applying voltage from −3 to 2 V. The observed laser emission frequency shift by electric field was 2 GHz. By using the three terminal devices, pure frequency modulation of the output light is, in principle, achievable.
Authors:
; ;  [1]
  1. Institute for Quantum Electronics, ETH Zurich, Wolfgang-Pauli Str. 16, 8093 Zurich (Switzerland)
Publication Date:
OSTI Identifier:
22257142
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ELECTRON MOBILITY; FREQUENCY MODULATION; LASERS; REFRACTIVE INDEX; THRESHOLD CURRENT; WAVEGUIDES