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

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9 Author(s)
Kohler, Rudeger ; NEST-INFM and Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, Italy ; Tredicucci, Alessandro ; Beltram, Fabio ; Beere, H.E.
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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-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. © 2003 American Institute of Physics.

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Applied Physics Letters  (Volume:82 ,  Issue: 10 )