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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 28, Iss. 10 — May. 15, 2003
  • pp: 810–812

Low-threshold quantum-cascade lasers at 3.5 THz (λ = 85 μm)

Rüdeger Köhler, Alessandro Tredicucci, Fabio Beltram, Harvey E. Beere, Edmund H. Linfield, A. Giles Davies, and David A. Ritchie  »View Author Affiliations


Optics Letters, Vol. 28, Issue 10, pp. 810-812 (2003)
http://dx.doi.org/10.1364/OL.28.000810


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Abstract

Chirped-superlattice quantum-cascade lasers are reported that emit at λ~85 μm (3.5 THz), which is to the authors' knowledge the longest wavelength demonstrated so far with this technology. Collected peak output powers of 1.5 mW per facet were measured at liquid-helium temperature, and a maximum operating temperature of 45 K was reached. Record low-threshold-current densities of 95 and 115 A cm-2 were observed in pulsed and continuous-wave operation, respectively. For the latter, output powers of a few hundred microwatts are estimated at low temperatures.

© 2003 Optical Society of America

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.5960) Lasers and laser optics : Semiconductor lasers
(250.0250) Optoelectronics : Optoelectronics

Citation
Rüdeger Köhler, Alessandro Tredicucci, Fabio Beltram, Harvey E. Beere, Edmund H. Linfield, A. Giles Davies, and David A. Ritchie, "Low-threshold quantum-cascade lasers at 3.5 THz (λ = 85 μm)," Opt. Lett. 28, 810-812 (2003)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-28-10-810

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