Scattering of the laser writing beam in photonic crystal fibre

Jovana Petrović, Thomas D.P. Allsop*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Point-by-point fibre grating fabrication by femtosecond laser pulses requires tight focusing of the pulses into the core of the fibre. This condition is not easily satisfied in photonic crystal fibres (PCFs) due to the pulse scattering by the holes. In this letter, we present a numerical model of propagation of tightly focused laser beam through PCF in a typical experimental setup. We investigate impact of the numerical aperture of the beam and hole refractive index on the beam scattering and identify optimal conditions for relating the findings to the requirements of grating fabrication. The results explain and quantify recent experimental grating inscription techniques and are indicative of birefringence observed in long-period gratings written by femtosecond laser pulses.

Original languageEnglish
Pages (from-to)1172-1175
Number of pages4
JournalOptics and Laser Technology
Issue number7
Early online date8 Apr 2010
Publication statusPublished - Oct 2010


  • laser machining
  • photonic crystal fibre


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