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Proceedings Paper

Compact 50W ultrashort pulse fiber laser for precision and high-speed material processing
Author(s): L. Shah; M. E. Fermann; J. W. Dawson; C. P. J. Barty
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Paper Abstract

We have previously demonstrated ultrashort pulse amplification in fiber systems beyond the B-integral limit. Here we report on recent experiments to increase the average power of such systems, and their application to high-speed material processing. A compact fiber chirped pulse amplification system, producing sub-picosecond 50 &mgr;J pulses at a repetition rate of 1 MHz, is obtained by implementing a fiber stretcher and a 1780 l/mm dielectric diffraction grating compressor. Despite a substantial residual dispersion mismatch between stretcher and compressor, the cubicon fiber amplifier allows for the generation of sub-picosecond pulses with sufficient quality for high-speed micromachining applications. Moreover, the dielectric grating compressor allows power independent near-diffraction limited beam quality as required for precision micro-machining. We utilize this laser to mill aluminum, alumina, and glass targets with material removal rates >0.2 mm3/s in all three materials.

Paper Details

Date Published: 20 February 2007
PDF: 6 pages
Proc. SPIE 6453, Fiber Lasers IV: Technology, Systems, and Applications, 64530Z (20 February 2007); doi: 10.1117/12.713437
Show Author Affiliations
L. Shah, IMRA America, Inc. (United States)
M. E. Fermann, IMRA America, Inc. (United States)
J. W. Dawson, Lawrence Livermore National Lab. (United States)
C. P. J. Barty, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 6453:
Fiber Lasers IV: Technology, Systems, and Applications
Donald J. Harter; Andreas Tünnermann; Jes Broeng; Clifford Headley III, Editor(s)

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