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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 24 — Nov. 21, 2011
  • pp: 24810–24815

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

M. C. Wanke, A. D. Grine, C. T. Fuller, C. D. Nordquist, M. J. Cich, J. L. Reno, and Mark Lee  »View Author Affiliations


Optics Express, Vol. 19, Issue 24, pp. 24810-24815 (2011)
http://dx.doi.org/10.1364/OE.19.024810


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Abstract

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 ∼0.5 MHz. While the locked DF signal has ≤ 1 Hz linewidth and negligible drift over ∼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.

© 2011 OSA

OCIS Codes
(040.2840) Detectors : Heterodyne
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(250.3140) Optoelectronics : Integrated optoelectronic circuits
(040.2235) Detectors : Far infrared or terahertz
(140.3425) Lasers and laser optics : Laser stabilization
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: September 12, 2011
Revised Manuscript: October 20, 2011
Manuscript Accepted: October 21, 2011
Published: November 18, 2011

Citation
M. C. Wanke, A. D. Grine, C. T. Fuller, C. D. Nordquist, M. J. Cich, J. L. Reno, and Mark Lee, "Common mode frequency instability in internally phase-locked terahertz quantum cascade lasers," Opt. Express 19, 24810-24815 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-24-24810


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