Photo-structural transformation of chalcogenide glasses under non-linear absorption of laser radiation

Optical properties and applications of chalcogenide glasses: a review

“…From their results it can be noted that the two-photon absorption coefficient increases when the gap of the glass becomes closer to the photon energy corresponding to the excitation wavelength, which is consistent with the theoretical work of Sheik-Bahae et al [24]. Photoinduced losses (absorption and scattering) are produced in chalcogenide glasses on exposure to high power laser radiation (10 8 W/cm 2 ), when the photon energy is such that hm < E g [25]. Such irradiation results in both reversible and irreversible effects.…”

“…The process is believed to be connected with the non-linear excitation of glass. Belykh et al [25] also concluded from the square dependence of photoinduced losses on the irradiance that a two-photon or twostep excitation of samples occurs during the IR exposure.…”

Ultralow Dispersion Multicomponent Thin‐Film Chalcogenide Glass for Broadband Gradient‐Index Optics

“…Although capable of inducing index changes across large areas, temperature gradients are not effective for the creation of complex index profiles required for GRIN optics. Meanwhile, thin‐film chalcogenide glasses have been shown to be highly photosensitive to wavelengths near the band gap, facilitating diffusion of elements within the glassy matrix . Our novel fabrication process utilizes this phenomenon to achieve highly controlled nanocrystal growth using a two‐step approach ( Figure a).…”

Quantitative estimation of crystallization kinetics in GeGaS and Au‐doped GeGaS glass‐ceramics

“…However, in the form of glasses, chalcogenides are somewhat notorious for their weak mechanical property. When exposed to the strong laser irradiation, the glasses are usually damaged and the glass surface is “burnt” creating gross craters far bigger than the irradiated spot . One of the solutions to improve such weak mechanical property is to induce the growth of the crystalline grains in the glasses via external energy input, such as heating, ion or laser radiation, and thus create so‐called chalcogenide glass‐ceramics.…”

“…When exposed to the strong laser irradiation, the glasses are usually damaged and the glass surface is "burnt" creating gross craters far bigger than the irradiated spot. [5][6][7][8][9] One of the solutions to improve such weak mechanical property is to induce the growth of the crystalline grains in the glasses via external energy input, such as heating, ion or laser radiation, and thus create so-called chalcogenide glass-ceramics. This has been successfully demonstrated that the mechanical hardness can be improved several times once the glass-ceramics are created.…”