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Université Jean Monnet – Saint-Etienne |  |
Journal articles
Transmission volume phase holographic gratings in photo-thermo-refractive glass written with femtosecond laser Bessel beams
Abstract : Transmission volume phase holographic gratings were fabricated in bulk photo-
thermo-refractive glass using zero-order femtosecond laser Bessel beams and subsequent
thermal treatment. Microstructures composed of nano-sized crystals were observed in the
exposed regions. The concentration of nano-crystals depended on the writing power, but the
size of the nano-crystals was found to be quasi power-independent. Low writing power led to sparse nano-crystals, while optimized writing po
wer achieved dense nano-crystals distribution and high refractive index change. Effects of the gratings thickness, writing laser power and
thermal treatment on the diffraction efficiency were investigated. A maximum diffraction
efficiency of 94.73% was achieved (at 532 nm testing wavelength) with 1 mm grating
thickness at period of 5 μm
Keywords :
laser fabrication
https://hal-ujm.archives-ouvertes.fr/ujm-01432521
Contributor : Razvan Stoian <>
Submitted on : Wednesday, January 11, 2017 - 5:17:58 PM
Last modification on : Monday, January 13, 2020 - 5:46:06 PM
Contributor : Razvan Stoian <>
Submitted on : Wednesday, January 11, 2017 - 5:17:58 PM
Last modification on : Monday, January 13, 2020 - 5:46:06 PM