Up to 10 meter-long Kagome hollow-core-photonic-crystal-fibers were used to successfully deliver Yb-laser pulses with milli-Joule energy-level and 600-femtosecond pulse-width in robustly single-mode fashion. Self-compression to ~50fs, and intensity-level nearing petawatt/cm2 were achieved. Free focusing-optics laser-micromachining is demonstrated on different materials.

© 2013 Optical Society of America

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