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

被引：60

作者：

Köhler, R

Tredicucci, A

Beltram, F

Beere, HE

Linfield, EH

Davies, AG

Ritchie, DA

Dhillon, SS

Sirtori, C

机构：

[1] INFM, NEST, I-56126 Pisa, Italy

[2] Scuola Normale Super Pisa, I-56126 Pisa, Italy

[3] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[4] Thales Res & Technol, F-91404 Orsay, France

来源：

APPLIED PHYSICS LETTERS | 2003年 / 82卷 / 10期

关键词：

D O I：

10.1063/1.1559419

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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.

引用

页码：1518 / 1520

页数：3

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