X-ray preconditioning for enhancing refractive index contrast in femtosecond laser photoinscription of embedded waveguides in pure silica - Université Jean-Monnet-Saint-Étienne Access content directly
Journal Articles Optical Materials Express Year : 2019

X-ray preconditioning for enhancing refractive index contrast in femtosecond laser photoinscription of embedded waveguides in pure silica

Emmanuel Marin
Sylvain Girard
Aziz Boukenter
Youcef Ouerdane
Razvan Stoian

Abstract

We investigate femtosecond pulse laser-induced refractive index changes (∆n) in bulk fused silica (Corning 7980) subject to prior hard (40 keV) X-ray irradiation with accumulated doses up to 6 MGy. The preconditioning before photoinscription improves strongly the light transport of the laser-written embedded waveguides in a range of fluences and accumulation doses. Results show that the ultrafast laser-induced ∆n is higher in samples pre-irradiated with X-rays at similar laser photon dose. The effect lies in the kick-off generation of defects and precursors by energetic X-ray photons, enhancing a subsequent laser-induced densification process. The photoinscription efficiency increases up to a saturation point and the pre-treatment can be considered as an effective option for high contrast low loss index modifications and waveguiding structures in glasses.
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Dates and versions

ujm-01964642 , version 1 (10-11-2020)

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Maxime Royon, Emmanuel Marin, Sylvain Girard, Aziz Boukenter, Youcef Ouerdane, et al.. X-ray preconditioning for enhancing refractive index contrast in femtosecond laser photoinscription of embedded waveguides in pure silica. Optical Materials Express, 2019, 9 (1), pp.65. ⟨10.1364/OME.9.000065⟩. ⟨ujm-01964642⟩
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