The cw operation of chirped-superlattice quantum-cascade lasers emitting at lambdasimilar to67 mum (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. (C) 2003 American Institute of Physics.

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

TREDICUCCI, ALESSANDRO
Secondo
;
2003

Abstract

The cw operation of chirped-superlattice quantum-cascade lasers emitting at lambdasimilar to67 mum (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. (C) 2003 American Institute of Physics.
Kohler, R; Tredicucci, Alessandro; Beltram, F; Beere, He; Linfield, Eh; Davies, Ag; Ritchie, Da; Dhillon, Ss; Sirtori, C.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/495106
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