TITLE

High-performance continuous-wave operation of superlattice terahertz quantum-cascade lasers

AUTHOR(S)
Köhler, Rüdeger; Tredicucci, Alessandro; Beltram, Fabio; Beere, Harvey E.; Linfield, Edmund H.; Davies, A. Giles; Ritchie, David A.; Dhillon, Sukhdeep S.; Sirtori, Carlo
PUB. DATE
March 2003
SOURCE
Applied Physics Letters;3/10/2003, Vol. 82 Issue 10, p1518
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The cw operation of chirped-superlattice quantum-cascade lasers emitting at λ∼67 µm (4.4 THz) is analyzed. Collected (min. 33% efficiency) output powers of 4 mW per facet are measured at liquid helium temperatures and a maximum operating temperature of 48 K is reached. Under pulsed excitation at duty cycles of 0.5%-1%, slightly higher (10%) peak powers are reached, and the device can be operated up to 67 K. Low threshold current densities of 165 and 185 A cm[sup -2] are observed in pulsed and cw operation, respectively. The operation of the laser is examined using the Hakki-Paoli technique to estimate the net gain of the structure.
ACCESSION #
9214452

 

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