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Amorphous Ge-Sb-Se thin films were co-sputtered from $
m GeSe_4$GeSe4 and $
m Sb_2
m Se_3$Sb2Se3 targets. Depending on the film composition, linear optical properties were studied by ellipsometry. The Kerr coefficient and two-photon absorption coefficient were estimated using Sheik-Bahae's formalism for co-sputtered films of $
m GeSe_4 \text -
m Sb_2
m Se_3$GeSe4-Sb2Se3 compared to $
m GeSe_2\text -
m Sb_2
m Se_3$GeSe2-Sb2Se3 pseudo-binary system and $
m As_2
m Se_3$As2Se3 as reference. The Kerr coefficient was found within
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