Compact 50W ultrashort pulse fiber laser for precision and high-speed material processing

L. Shah; M. E. Fermann; J. W. Dawson; C. P. J. Barty

doi:10.1117/12.713437

20 February 2007 Compact 50W ultrashort pulse fiber laser for precision and high-speed material processing

L. Shah, M. E. Fermann, J. W. Dawson, C. P. J. Barty

Proceedings Volume 6453, Fiber Lasers IV: Technology, Systems, and Applications; 64530Z (2007) https://doi.org/10.1117/12.713437
Event: Lasers and Applications in Science and Engineering, 2007, San Jose, California, United States

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.

Citation Download Citation

L. Shah, M. E. Fermann, J. W. Dawson, and C. P. J. Barty "Compact 50W ultrashort pulse fiber laser for precision and high-speed material processing", Proc. SPIE 6453, Fiber Lasers IV: Technology, Systems, and Applications, 64530Z (20 February 2007); https://doi.org/10.1117/12.713437

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