Optical fibers of As 2 S 3 glasses: preparation and characterization
2015
Chalcogenide glasses based on arsenic sulfide (As2S3), arsenic selenide or telluride are known to exhibit high optical
nonlinearities which are necessary for advanced applications in telecommunications. Both, standard optical fibers and
microstructured fibers have been fabricated from chalcogenide glasses. In this paper we deal with As2S3 solid core fibers
and capillary fibers coated with a polymer jacket of UV acrylate. The guiding mechanism employing the reflection on
boundary of high-index glass (a refractive index of about 2.4) and hollow cavity (n=1) was confirmed by ray-optic
calculations.
Fibers were drawn from input As2S3 rods and tubes. The rods were prepared from extra pure arsenic and sulfur by their
melting in an evacuated ampoule. The tubes were prepared by using rotational melting technique in an evacuated
ampoule rotating at 1600 rpm. Rods and tubes were elongated into fibers by using a fiber drawing facilities for
preparation of optical fibers from soft optical glasses. Temperatures in a range 300-400 °C and drawing velocities of
about 0.1 m/s were used. Fibers were prepared either without any polymeric jacket or they were provided by a jacket of
UV acrylate (n ∼ 1.5). Fibers with diameters from 0.2 to 0.4 mm were fabricated.
Dimensions of prepared fibers were measured by optical microscopy without prior polishing. Transmission properties of
prepared fibers were characterized by measuring angular distributions of output power at the wavelength of 670 nm.
Optical losses of fibers exceeding 2 dB/m were determined by using the cut back method.
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