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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 4 — Feb. 15, 2010
  • pp: 3592–3600

Concentration effect of carbon nanotube based saturable absorber on stabilizing and shortening mode-locked pulse

Jin-Chen Chiu, Yi-Fen Lan, Chia-Ming Chang, Xi-Zong Chen, Chao-Yung Yeh, Chao-Kuei Lee, Gong-Ru Lin, Jiang-Jen Lin, and Wood-Hi Cheng  »View Author Affiliations


Optics Express, Vol. 18, Issue 4, pp. 3592-3600 (2010)
http://dx.doi.org/10.1364/OE.18.003592


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Abstract

We comprehensively investigated the concentration effect of dispersed single-walled carbon nanotubes (SWCNTs) in polymer films for being a saturable absorber (SA) to stabilize the mode locking performance of the erbium-doped fiber laser (EDFL) pulse through the diagnosis of its nonlinear properties of SA. The measured modulation depth was from 1 to 4.5% as the thickness increased 18 to 265 μm. The full-width half-maximum (FWHM) of the stable mode-locked EDFL (MLEDFL) pulse decreased from 3.43 to 2.02 ps as the concentrations of SWCNTs SA increased 0.125 to 0.5 wt%. At constant concentration of 0.125 wt%, the similar pulse shortening effect of the MLEDFL was also observed when the FWHM decreased from 3.43 to 1.85 ps as the thickness of SWCNTs SA increased 8 to 100 μm. With an erbium-doped fiber length of 80 cm, the shortest pulse width of 1.85 ps were achieved at 1.56μm with a repetition rate of 11.1MHz and 0.2 mW of the output power under an output coupling ratio of 5%. An in-depth study on the stable mode-locked pulse formation employing SWCNTs SA, it is possible to fabricate the SWCNT films for use in high performance MLEDFL and utilization of many other low-cost nanodevices.

© 2010 OSA

OCIS Codes
(140.3560) Lasers and laser optics : Lasers, ring
(140.4050) Lasers and laser optics : Mode-locked lasers

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: December 3, 2009
Revised Manuscript: January 20, 2010
Manuscript Accepted: January 24, 2010
Published: February 4, 2010

Citation
Jin-Chen Chiu, Yi-Fen Lan, Chia-Ming Chang, Xi-Zong Chen, Chao-Yung Yeh, Chao-Kuei Lee, Gong-Ru Lin, Jiang-Jen Lin, and Wood-Hi Cheng, "Concentration effect of carbon nanotube based saturable absorber on stabilizing and shortening mode-locked pulse," Opt. Express 18, 3592-3600 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-4-3592


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