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
收藏
页码：24810 / 24815
页数：6
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