skip to main content

SciTech ConnectSciTech Connect

Title: Terahertz generation in mid-infrared quantum cascade lasers with a dual-upper-state active region

We report the performance of room temperature terahertz sources based on intracavity difference-frequency generation in mid-infrared quantum cascade lasers with a dual-upper-state (DAU) active region. DAU active region design is theoretically expected to produce larger optical nonlinearity for terahertz difference-frequency generation, compared to the active region designs of the bound-to-continuum type used previously. Fabricated buried heterostructure devices with a two-section buried distributed feedback grating and the waveguide designed for Cherenkov difference-frequency phase-matching scheme operate in two single-mode mid-infrared wavelengths at 10.7 μm and 9.7 μm and produce terahertz output at 2.9 THz with mid-infrared to terahertz conversion efficiency of 0.8 mW/W{sup 2} at room temperature.
Authors:
; ; ; ;  [1] ; ;  [2]
  1. Central Research Laboratories, Hamamatsu Photonics K.K., 5000 Hirakuchi, Hamakita-ku, Hamamatsu 434-8601 (Japan)
  2. Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78758 (United States)
Publication Date:
OSTI Identifier:
22483080
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 25; Other Information: (c) 2015 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; CONVERSION; DESIGN; EFFICIENCY; EQUIPMENT; FEEDBACK; GRATINGS; LASERS; NONLINEAR PROBLEMS; PERFORMANCE; TEMPERATURE RANGE 0273-0400 K; WAVEGUIDES