Characteristics of filament induced Dammann gratings fabricated using femtosecond laser

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DOIResolve DOI: http://doi.org/10.1016/j.optlastec.2006.12.003
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TypeArticle
Journal titleOptics and Laser Technology
ISSN0030-3992
Volume39
Issue7
Pages13281333; # of pages: 6
SubjectDammann grating; refractive index; femtosecond laser
AbstractTo establish optimal processing conditions for direct write fabrication of diffractive optical elements such as gratings, waveguides, lenses, we have investigated the effect of process parameters such as scan speed, numerical aperture (NA) of objective lens, pulse energy on the characteristics of the filament induced inside fused silica with a femtosecond Ti:sapphire laser. The optimum process parameters were used to fabricate a number of Dammann gratings, 6×6 array, having different thicknesses and number of layers. The performance of these optical elements was evaluated by measuring their diffraction efficiencies. All gratings fabricated were strongly birefringent, the zero order spot with high intensity was not separated from the spot array, and the intensity distribution of 6×6 spot array exhibited some degree of nonuniformity. The single layer Dammann grating fabricated with a thickness of 80 μm attained a maximum diffraction efficiency of 38.8%.
Publication date
LanguageEnglish
AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedYes
NPARC number21274288
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Record identifier04d266a3-3686-45ca-82b8-6694d8a9151c
Record created2015-03-09
Record modified2016-05-09
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