Title

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

Abstract

The optical properties of commercial and experimental arsenic sulfide glasses were studied during and after exposure to pulsed Nd:YAG laser radiation at 1.064 and 1.318 μm. Photo-induced losses (absorption and scattering) are produced in chalcogenide glasses by high-power laser radiation, the with photon energy hv < Eg. This phenomena is only observed if the irradiance is greater than a value of about 108 W/cm2. Such exposure results in both reversible and irreversible structural transformations of these glasses in the exposed region. The reversible darkening is similar to the known effect of photo-structural transformations. It is connected with non-linear excitation to upper intrinsic levels of glass when it exposed to photons with energy less than glass bandgap. The irreversible contribution is due to the photo-induced localized destruction of bulk material, which is not completely erased by annealing near the glass transition temperature. Damage sites are responsible for absorption and scattering in this case. It is believed that a process of laser damage is caused by the thermal instability of structural irregularities randomly distributed in glass, which absorb laser radiation.

Publication Date

5-12-1997

Publication Title

Journal of Non-Crystalline Solids

Volume

213-214

Number of Pages

330-335

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/S0022-3093(96)00674-6

Socpus ID

0031166565 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0031166565

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