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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 6 — Mar. 14, 2011
  • pp: 5313–5318

Low noise erbium fiber fs frequency comb based on a tapered-fiber carbon nanotube design

Tsung-Han Wu, K. Kieu, N. Peyghambarian, and R. J. Jones  »View Author Affiliations

Optics Express, Vol. 19, Issue 6, pp. 5313-5318 (2011)

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We report on a low noise all-fiber erbium fs frequency comb based on a simple and robust tapered-fiber carbon nanotube (tf-CNT) design. We mitigate dominant noise sources to show that the free-running linewidth of the carrier-envelope offset frequency (fceo) can be comparable to the best reported performance to date for fiber-based frequency combs. A free-running fceo linewidth of ~20 kHz is demonstrated, corresponding to an improvement of ~30 times over previous work based on a CNT mode-locked fiber laser [Opt. Express 18, 1667 (2010)]. We also demonstrate the use of an acousto-optic modulator external to the laser cavity to stabilize fceo, enabling a 300 kHz feedback control bandwidth. The offset frequency is phase-locked with an in-loop integrated phase noise of ~0.8 rad from 10Hz to 400kHz. We show a resolution-limited linewidth of ~1 Hz, demonstrating over 90% of the carrier power within the coherent fceo signal. The results demonstrate that the relatively simple tf-CNT fiber laser design can provide a compact, robust and high-performance fs frequency comb.

© 2011 OSA

OCIS Codes
(320.7090) Ultrafast optics : Ultrafast lasers
(320.7160) Ultrafast optics : Ultrafast technology

ToC Category:
Ultrafast Optics

Original Manuscript: January 5, 2011
Revised Manuscript: February 10, 2011
Manuscript Accepted: February 21, 2011
Published: March 7, 2011

Tsung-Han Wu, K. Kieu, N. Peyghambarian, and R. J. Jones, "Low noise erbium fiber fs frequency comb based on a tapered-fiber carbon nanotube design," Opt. Express 19, 5313-5318 (2011)

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