Spectral behavior of a terahertz quantum-cascade laser

被引：19

作者：

Hensley, J. M. ^{[1
]}

Montoya, Juan ^{[1
]}

Allen, M. G. ^{[1
]}

Xu, J. ^{[2
,3
]}

Mahler, L. ^{[2
,3
]}

Tredicucci, A. ^{[2
,3
]}

Beere, H. E. ^{[4
]}

Ritchie, D. A. ^{[4
]}

机构：

[1] Phys Sci Inc, Andover, MA 01810 USA

[2] NEST INFM, I-56127 Pisa, Italy

[3] Scuola Normale Super Pisa, I-56127 Pisa, Italy

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

来源：

OPTICS EXPRESS | 2009年 / 17卷 / 22期

关键词：

SCHOTTKY DIODE; WHISKER DIODES; FREQUENCY;

D O I：

10.1364/OE.17.020476

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

In this paper, the spectral behavior of two terahertz (THz) quantum cascade lasers (QCLs) operating both pulsed and cw is characterized using a heterodyne technique. Both lasers emitting around 2.5 THz are combined onto a whisker contact Schottky diode mixer mounted in a corner cube reflector. The resulting difference frequency beatnote is recorded in both the time and frequency domain. From the frequency domain data, we measure the effective laser linewidth and the tuning rates as a function of both temperature and injection current and show that the current tuning behavior cannot be explained by temperature tuning mechanisms alone. From the time domain data, we characterize the intrapulse frequency tuning behavior, which limits the effective linewidth to approximately 5 MHz. (C) 2009 Optical Society of America

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页码：20476 / 20483

页数：8

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