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Title: Continuous operation of a monolithic semiconductor terahertz source at room temperature

We demonstrate room temperature continuous wave THz sources based on intracavity difference-frequency generation from mid-infrared quantum cascade lasers. Buried ridge, buried composite distributed-feedback waveguide with Čerenkov phase-matching scheme is used to reduce the waveguide loss and enhance the heat dissipation for continuous wave operation. Continuous emission at 3.6 THz with a side-mode suppression ratio of 20 dB and output power up to 3 μW are achieved, respectively. THz peak power is further scaled up to 1.4 mW in pulsed mode by increasing the mid-infrared power through increasing the active region doping and device area.
Authors:
; ; ; ;  [1]
  1. Center for Quantum Devices, Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, Illinois 60208 (United States)
Publication Date:
OSTI Identifier:
22300098
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COOLING; EMISSION; ENERGY LOSSES; FEEDBACK; HEAT TRANSFER; LASER RADIATION; OPERATION; SEMICONDUCTOR MATERIALS; TEMPERATURE RANGE 0273-0400 K; THERMAL DIFFUSIVITY; THERMAL EFFLUENTS; THZ RANGE; WAVEGUIDES