Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
Journal Home About Issues in Progress Current Issue All Issues Feature Issues

Operation of terahertz quantum-cascade lasers at 164 K in pulsed mode and at 117 K in continuous-wave mode

Benjamin S. Williams, Sushil Kumar, Qing Hu, and John L. Reno

Open Access Open Access

Abstract

We report the demonstration of a terahertz quantum-cascade laser that operates up to 164 K in pulsed mode and 117 K in continuous-wave mode at approximately 3.0 THz. The active region was based on a resonant-phonon depopulation scheme and a metal-metal waveguide was used for modal confinement. Copper to copper thermocompression wafer bonding was used to fabricate the waveguide, which displayed improved thermal properties compared to a previous indium-gold bonding method.

©2005 Optical Society of America

Full Article  |  PDF Article
More Like This
Terahertz quantum cascade lasers with copper metal-metal waveguides operating up to 178 K

Mikhail A. Belkin, Jonathan A. Fan, Sahand Hormoz, Federico Capasso, Suraj P. Khanna, Mohamed Lachab, A. Giles Davies, and Edmund H. Linfield
Opt. Express 16(5) 3242-3248 (2008)

Continuous wave operation of a superlattic quantum cascade laser emitting at 2 THz

Chris Worrall, Jesse Alton, Mark Houghton, Stefano Barbieri, Harvey E. Beere, David Ritchie, and Carlo Sirtori
Opt. Express 14(1) 171-181 (2006)

Terahertz quantum cascade lasers operating up to ∼ 200 K with optimized oscillator strength and improved injection tunneling

S. Fathololoumi, E. Dupont, C.W.I. Chan, Z.R. Wasilewski, S.R. Laframboise, D. Ban, A. Mátyás, C. Jirauschek, Q. Hu, and H. C. Liu
Opt. Express 20(4) 3866-3876 (2012)

View More...

Cited By

Optica participates in Crossref's Cited-By Linking service. Citing articles from Optica Publishing Group journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (4)
Fig. 1.
Fig. 1. (a) Calculated conduction band schematic, with the four-well module outlined in a dotted box. Beginning with the left injection barrier, the layer thicknesses in Å are 49/79/25/66/41/156/33/90, and the 156 Å well is doped at 1.9×1016 cm-3, which yields a sheet density of 3.0×1010 cm-2 per module. (b) Scanning electron micrograph of the cleaved facet of a 23-µm-wide ridge waveguide. (c) Modal intensity for fundamental mode calculated with finite-element solver.

Download Full Size | PDF

Fig. 2.
Fig. 2. Optical power versus current measured from a 48-µm-wide, 0.99-mm-long ridge using 200-ns pulses repeated at 10 kHz. The lower inset shows an expanded version of the high temperature L-I curves. The upper inset displays the threshold current density versus temperature.

Download Full Size | PDF

Fig. 3.
Fig. 3. Continuous-wave characteristics for a 23-µm-wide, 1.22-mm-long ridge at various heat sink temperatures, where the optical power is measured from a single facet. The lower panel displays the V-I and dV/dI-I characteristics at several temperatures. The upper inset shows typical spectra at several temperatures, and the lower inset displays the relative size of the threshold discontinuity in the differential resistance versus temperature.

Download Full Size | PDF

Fig. 4.
Fig. 4. (a) Two-dimensional heat flow model calculated with a nonlinear finite-element solver. The 800-µm-wide, 170-µm-thick n + GaAs substrate extends beyond the margins of the figure. The lower boundary is set to 117 K, and the active region is uniformly driven by a power source of 1.1×107 W/cm3, which corresponds lasing conditions at T sink=117 K cw operation.

Download Full Size | PDF

Equations (1)

Equations on this page are rendered with MathJax. Learn more.

d L d I = 1 2 ħ ω e N mod α m α w + α m η i ,
Select as filters
Select Topics Cancel
Top
       
© Copyright 2024 | Optica Publishing Group. All rights reserved, including rights for text and data mining and training of artificial technologies or similar technologies.
Privacy | Terms of Use