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Proceedings Paper

Actively Mode-Locked Fiber Lasers
Author(s): M. W. Phillips; A. I. Ferguson; D. C. Hanna; M. J. McCarthy; P. J. Suni
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Paper Abstract

We review recent investigation into the active mode-locking of rare earth doped silica, monomode fiber lasers. Dopants include Nd3+, Er3+ and Yb3+:Er3+ and mode-locking has been accomplished either by amplitude modulation or by phase modulation. Both bulk optic and integrated optic modulators have been used. Pulses of 4 psec duration have been observed in an Er3+-doped fiber laser with an integrated amplitude modulator. 20 psec pulses have been produced from a Nd3-doped fiber laser with a bulk phase modulator. In both these systems, the introduction of anomalous group velocity dispersion compensates for self-phase modulation, resulting in bandwidth-limited operation. The paper concentrates mainly on three experiments involving the mode-locking of fiber lasers by active phase modulation. A bulk LiNb03 phase modulator produces pulses of 20 psec and 37 psec respectively in Nd3-doped and Yb3:Er3-doped fiber lasers. The third system incorporates intra-fiber phase modulation. This allows considerable simplification of the laser cavity, resulting in a diode-pumpable source of 80 psec mode-locked pulses with a threshold pump power of 520 pW and a slope efficiency of 48%.

Paper Details

Date Published: 15 February 1990
PDF: 11 pages
Proc. SPIE 1171, Fiber Laser Sources and Amplifiers, (15 February 1990); doi: 10.1117/12.963160
Show Author Affiliations
M. W. Phillips, University of Southampton (United Kingdom)
A. I. Ferguson, University of Southampton (United Kingdom)
D. C. Hanna, University of Southampton (United Kingdom)
M. J. McCarthy, University of Southampton (United Kingdom)
P. J. Suni, University of Southampton (United Kingdom)


Published in SPIE Proceedings Vol. 1171:
Fiber Laser Sources and Amplifiers
Michel J. F. Digonnet, Editor(s)

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