Common mode frequency instability in internally phase-locked terahertz quantum cascade lasers

被引：5

作者：

Wanke, M. C. ^{[1
]}

Grine, A. D. ^{[2
]}

Fuller, C. T. ^{[1
]}

Nordquist, C. D. ^{[1
]}

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

Reno, J. L. ^{[1
]}

Lee, Mark ^{[1
]}

机构：

[1] Sandia Natl Labs, Albuquerque, NM 87185 USA

[2] LMATA Govt Serv, Albuquerque, NM 87109 USA

来源：

OPTICS EXPRESS | 2011年 / 19卷 / 24期

基金：

美国能源部;

关键词：

SCHOTTKY DIODE; LOCKING; LINEWIDTH;

D O I：

10.1364/OE.19.024810

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Feedback from a diode mixer integrated into a 2.8 THz quantum cascade laser (QCL) was used to phase lock the difference frequencies (DFs) among the Fabry-Perot (F-P) longitudinal modes of a QCL. Approximately 40% of the DF power was phase locked, consistent with feedback loop bandwidth of 10 kHz and phase noise bandwidth similar to 0.5 MHz. While the locked DF signal has <= 1 Hz linewidth and negligible drift over similar to 30 min, mixing measurements between two QCLs and between a QCL and molecular gas laser show that the common mode frequency stability is no better than a free-running QCL. (C) 2011 Optical Society of America

引用

页码：24810 / 24815

页数：6

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