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Proceedings Paper

Picosecond fiber laser oscillator at 1.5 μm with 2.3W average output power and 160 MHz repetition rate
Author(s): Pavel Polynkin; Alexander Polynkin; Dmitriy Panasenko; Masud Mansuripur; N. Peyghambarian; Jerome Moloney
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Paper Abstract

Heavily doped active fibers based on the soft phosphate glass offer an attractive gain medium for compact and high-power laser oscillators. We report a passively modelocked fiber oscillator at 1.5μm based on such active fiber. The standing-wave laser cavity consists of a 20cm-long piece of the side-pumped active phosphate fiber which is heavily co-doped with Er and Yb ions, and a low-ratio fused coupler. The length of the all-fiber laser cavity is 65cm. The modelocked operation of the oscillator is started and sustained by a Semiconductor Saturable Absorber Mirror (SESAM), and no additional pulse narrowing mechanism is used. In order to avoid a premature over-saturation of the SESAM, the fiber end which is butt-coupled to the SESAM is adiabatically tapered which expands the propagating fiber mode and decreases the power density incident on the absorber substantially. The stable modelocked operation of the laser oscillator occurs in the range between 0.65W and 2.3W of the average output power, which is limited by the maximum available pump power at 975nm. The peak pulse power is limited by the saturated SESAM at ~450W, and the pulse width grows from 11psec to 35psec as the pump power is increased. At the pulse repetition rate of 160MHz, the pulse energy reaches 14.4nJ. Our laser oscillator combines the convenience of the all-fiber construction with the power performance previously achievable only with the modelocked bulk-optic laser oscillators or more complex systems involving fiber amplifiers.

Paper Details

Date Published: 23 February 2006
PDF: 8 pages
Proc. SPIE 6102, Fiber Lasers III: Technology, Systems, and Applications, 610216 (23 February 2006); doi: 10.1117/12.647264
Show Author Affiliations
Pavel Polynkin, College of Optical Sciences, The Univ. of Arizona (United States)
Alexander Polynkin, College of Optical Sciences, The Univ. of Arizona (United States)
Dmitriy Panasenko, College of Optical Sciences, The Univ. of Arizona (United States)
Masud Mansuripur, College of Optical Sciences, The Univ. of Arizona (United States)
N. Peyghambarian, College of Optical Sciences, The Univ. of Arizona (United States)
Jerome Moloney, College of Optical Sciences, The Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 6102:
Fiber Lasers III: Technology, Systems, and Applications
Andrew J. W. Brown; Johan Nilsson; Donald J. Harter; Andreas Tünnermann, Editor(s)

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