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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 37, Iss. 22 — Nov. 15, 2012
  • pp: 4729–4731

High-finesse cavity external optical feedback DFB laser with hertz relative linewidth

Yang Zhao, Qiang Wang, Fei Meng, Yige Lin, Shaokai Wang, Ye Li, Baike Lin, Shiying Cao, Jianping Cao, Zhanjun Fang, Tianchu Li, and Erjun Zang  »View Author Affiliations


Optics Letters, Vol. 37, Issue 22, pp. 4729-4731 (2012)
http://dx.doi.org/10.1364/OL.37.004729


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Abstract

We report hertz level relative linewidth distributed feedback diode lasers with external optical feedback from a high finesse F-P cavity, and demonstrate the efficient phase noise suppression and laser linewidth reduction of the optical feedback technique. The laser phase noise is dramatically suppressed throughout the measurement frequency range. Especially at the Fourier frequency of 17 kHz, approximately the linewidth of the F-P reference cavity, the laser phase noise is significantly suppressed by more than 92 dB. Above this Fourier frequency, the noise maintains a white phase noise plateau as low as 124.4dBc/Hz. The laser’s FWHM linewidth is reduced from 7 MHz to 4.4 Hz, and its instantaneous linewidth is 220 mHz in the Lorentzian fitting.

© 2012 Optical Society of America

OCIS Codes
(140.2020) Lasers and laser optics : Diode lasers
(140.3410) Lasers and laser optics : Laser resonators
(140.4780) Lasers and laser optics : Optical resonators
(140.3425) Lasers and laser optics : Laser stabilization

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: August 20, 2012
Revised Manuscript: October 4, 2012
Manuscript Accepted: October 15, 2012
Published: November 14, 2012

Virtual Issues
November 20, 2012 Spotlight on Optics

Citation
Yang Zhao, Qiang Wang, Fei Meng, Yige Lin, Shaokai Wang, Ye Li, Baike Lin, Shiying Cao, Jianping Cao, Zhanjun Fang, Tianchu Li, and Erjun Zang, "High-finesse cavity external optical feedback DFB laser with hertz relative linewidth," Opt. Lett. 37, 4729-4731 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-22-4729


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