Heterodyne mixing of two far-infrared quantum cascade lasers by use of a point-contact Schottky diode

被引：52

作者：

Barbieri, S

Alton, J

Beere, HE

Linfield, EH

Ritchie, DA

Withington, S

Scalari, G

Ajili, L

Faist, J

机构：

[1] TeraView Ltd, Cambridge CB4 0WG, England

[2] Univ Cambridge, Cavendish Lab, Cambridge CV2 0HE, England

[3] Univ Neuchatel, Inst Phys, CH-2000 Neuchatel, Switzerland

来源：

OPTICS LETTERS | 2004年 / 29卷 / 14期

关键词：

D O I：

10.1364/OL.29.001632

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrate heterodyne mixing of two free-running, multimode, 3.3-THz quantum cascade lasers by use of a point-contact Schottky diode. By temperature tuning the emission wavelength of one laser, a difference frequency signal spanning the 2-4-GHz range is obtained, with a signal-to-noise ratio of 30 dB. The frequency of the heterodyne signal is subject to random fluctuations of a few megahertz, principally from instabilities in the temperatures of the devices. From single-shot measurements we derive an instantaneous linewidth for a single Fabry-Perot mode of 20 kHz, corresponding to an integration time of 3.6 ms. (C) 2004 Optical Society of America.

引用

页码：1632 / 1634

页数：3

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