Abstract
Chalcogenide glasses from (GeSe2)100-x(Sb2Se3)x system were synthesized, with x varying from 5 to 70, in order to evaluate the influence of antimony selenide addn. on nonlinear optical properties and photosensitivity. Nonlinear refractive index and two photon absorption coeffs. were measured both at 1064 nm in picosecond regime using the Z-scan technique and at 1.55 μm in femtosecond regime using an original method based on direct anal. of beam profile change while propagating in the chalcogenide glasses. The study of their photosensitivity at 1.55 μm revealed highly glass compn. dependent behavior and quasi-photostable compns. have been identified in femtosecond regime. To better understand these characteristics, the evolution of the glass transition temp., d. and structure with the chem. compn. were detd.
Highlights
Chalcogenide glasses, based on S, Se or Te elements in combination with suitable elements from 14th or 15th group of the periodical system (Ge, As, Sb, etc.), are known to present high linear refractive index, photosensitivity to light exposure [1,2,3,4], and to be highly nonlinear [5,6,7]
For mentioned integrated optical devices, a key prerequisite is an identification of appropriate bulk glass composition regarding the nonlinear figure of merit (FOM) for photonic applications
Among the variety of chalcogenide glasses compositions, materials presenting high nonlinear refractive index represented by n2 (m2/W), low two photon absorption (TPA) defined by nonlinear absorption coefficient β (m/W), leading to optimized
Summary
Chalcogenide glasses, based on S, Se or Te elements in combination with suitable elements from 14th or 15th group of the periodical system (Ge, As, Sb, etc.), are known to present high linear refractive index, photosensitivity to light exposure [1,2,3,4], and to be highly nonlinear [5,6,7] They present great Kerr nonlinearities at femtosecond time scale which can reach values several orders of magnitude larger than that of silica glass, variable two-photon absorption depending on their bandgap and insignificant free carrier absorption [8]. In case of Ge-As-Se system glasses rich in Ge (Ge/As ratio varying from 1.1 to 2.8), Gopinath et al [25] showed that variations of the nonlinear refractive index cannot be satisfactorily explained considering the n2 dependence on lone pair electron density. Photosensitivity of Ge-Sb-Se glasses is studied at 1.55 μm in femtosecond regime
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