Abstract

We propose and demonstrate a new saturable absorber based on a fiber taper embedded in a carbon nanotube/polymer composite. Greater than a 10% reduction in absorption (due to saturation) is directly measured for our saturable absorber. Using an embedded fiber-taper saturable absorber, we built an all-fiber mode-locked ring laser, which produces 594fs1.7nJ pulses with a repetition rate of 13.3MHz.

© 2007 Optical Society of America

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References

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2007 (3)

Y. Song, K. Morimune, Sze Y. Set, and Shinji Yamashita, Appl. Phys. Lett. 90, 021101 (2007).
[CrossRef]

Y. C. Chen, N. R. Raravikar, L. S. Schadler, P. M. Ajayan, Y. P. Zhao, T. M. Lu, G. C. Wang, and X. C. Zhang, Appl. Phys. Lett. 81, 975 (2007).
[CrossRef]

Y.-W. Song, S. Yamashita, C. S. Goh, and S. Y. Set, Opt. Lett. 32, 148 (2007).
[CrossRef]

2006 (1)

2005 (1)

2004 (2)

S. Yamashita, Y. Inoue, S. Maruyama, Y. Murakami, H. Yaguchi, M. Jablonski, and S. Y. Set, Opt. Lett. 29, 1581 (2004).
[CrossRef] [PubMed]

Sze Y. Set, H. Yaguchi, Y. Tanaka, and M. Jablonski, IEEE J. Sel. Top. Quantum Electron. 10, 137 (2004).
[CrossRef]

2000 (1)

Appl. Phys. Lett. (2)

Y. Song, K. Morimune, Sze Y. Set, and Shinji Yamashita, Appl. Phys. Lett. 90, 021101 (2007).
[CrossRef]

Y. C. Chen, N. R. Raravikar, L. S. Schadler, P. M. Ajayan, Y. P. Zhao, T. M. Lu, G. C. Wang, and X. C. Zhang, Appl. Phys. Lett. 81, 975 (2007).
[CrossRef]

IEEE J. Sel. Top. Quantum Electron. (1)

Sze Y. Set, H. Yaguchi, Y. Tanaka, and M. Jablonski, IEEE J. Sel. Top. Quantum Electron. 10, 137 (2004).
[CrossRef]

Opt. Express (1)

Opt. Lett. (4)

Other (3)

J. Ye, Femtosecond Optical Frequency Comb: Principle, Operation, and Applications (Springer, 2005).
[CrossRef]

F. Dausinger, Femtosecond Technology for Technical and Medical Applications (Springer, 2004).

M. E. Fermann, Ultrafast Lasers: Technology and Applications (Marcel Dekker, 2003).

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Figures (5)

Fig. 1
Fig. 1

Absorption spectrum of SWCNTs. Solution of SWCNTs in alcohol was prepared and sprayed on a microscope slide; the absorption spectrum of the SWCNTs was then measured using a spectrometer. Inset: SEM micrograph of SWCNTs spray coated on a silicon substrate.

Fig. 2
Fig. 2

Diagram of a mode-locked fiber ring laser incorporating a saturable absorber in the form of a fiber taper embedded within a SWCNT–polymer composite. The ring consists of a 2 m length of erbium-doped fiber (Leikki), about 1 m of Flexcor fiber in the WDM coupler (Corning), and about 12 m of SMF28 (Corning).

Fig. 3
Fig. 3

Laser output optical power spectrum. Insets: left, output pulse train of the mode-locked laser; right, rf spectrum of the fundamental harmonic of the laser pulse train.

Fig. 4
Fig. 4

Second harmonic interferometric autocorrelation signal observed at (a) 190 mW and (b) 260 mW of pump power. A broad pedestal appears to accompany the main pulse at a higher pump power.

Fig. 5
Fig. 5

Absorption of a typical fiber taper (embedded in a SWCNT–polymer composite) as a function of the average input power. Inset: diagram showing an embedded fiber taper used as a saturable absorber.

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