Pumping a nonlinear germanosilicate fiber with intense near-infrared femtosecond laser pulses for supercontinuum generation may invoke multiphoton-assisted photosensitivity of glasses to write a long-period fiber grating. In sharp contrast to the spontaneous formation of a Hill grating that resonates with the writing wavelength through first-order diffraction, the long-period fiber grating resonates with the writing wavelength through second-order diffraction. This finding highlights the surprising light-matter interaction in a waveguide.

Original languageEnglish (US)
Article number121104
JournalApplied Physics Letters
Issue number12
StatePublished - Sep 20 2010

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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