Improved hollow-core photonic crystal fiber design for delivery of nanosecond pulses in laser micromachining applications.

@article{Shephard2005ImprovedHP,
  title={Improved hollow-core photonic crystal fiber design for delivery of nanosecond pulses in laser micromachining applications.},
  author={Jonathan D. Shephard and François Couny and Phillip St J Russell and Julian D C Jones and J. C. Knight and Duncan P. Hand},
  journal={Applied optics},
  year={2005},
  volume={44 21},
  pages={4582-8}
}
We report the delivery of high-energy nanosecond pulses (approximately 65 ns pulse width) from a high-repetition-rate (up to 100 kHz) Q-switched Nd:YAG laser through the fundamental mode of a hollow-core photonic crystal fiber (HC-PCF) at 1064 nm. The guided mode in the HC-PCF has a low overlap with the glass, allowing delivery of pulses with energies above those attainable with other fibers. Energies greater than 0.5 mJ were delivered in a single spatial mode through the hollow-core fiber… CONTINUE READING