25 September 2014 Photoinduced GRIN lens formation in chalcogenide Ge-As-S thin films
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Proceedings Volume 9288, Photonics North 2014; 92880L (2014) https://doi.org/10.1117/12.2075129
Event: Photonics North 2014, 2014, Montréal, Canada
We describe the photo induced formation of gradient index (GRIN) lenses in thin films of chalcogenide glass (ChG) of Ge25As30S45 composition. We examine the changes of thickness of these samples by DekTak profilometry, as well as the optical performance and wave front distortions of the obtained lenses by using a Shack Hartmann sensor. The GRIN formation is related to the photo induced shift of the band gap towards shorter wavelengths (so-called photo-bleaching effect). The corresponding photo-induced birefringence of this material is in the origin of anisotropic GRIN lenses formed [1].
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K. Palanjyan, K. Palanjyan, R. Vallée, R. Vallée, T. Galstian, T. Galstian, "Photoinduced GRIN lens formation in chalcogenide Ge-As-S thin films", Proc. SPIE 9288, Photonics North 2014, 92880L (25 September 2014); doi: 10.1117/12.2075129; https://doi.org/10.1117/12.2075129

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