Surface Analysis and Treatment of Extruded Fluoride Phosphate Glass Preforms for Optical Fiber Fabrication

Abstract

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UV-transmitting step-index fluorophosphate glass fiber fabricated by the crucible technique

“…Work is ongoing to improve the fabrication process and eliminate these striae. In the literature, as above mentioned, only four works dealing with the fabrication and optical characterization of fluorophosphate glass fibers was reported, to the best of our knowledge [17,18,22,23]. In their work, Zou et al from Hoya Corporation reported ultra-low losses in their fibers with a minimum loss in the UV of 0.11 dB/m at 365 nm while extrinsic absorption bands were observed due to the presence of transition metal impurities at 340 nm (Fe 3þ ), 520 nm (Cr 3þ , Ni 2þ ) and 800 nm (Cu 2þ , Fe 2þ ) [17,18].…”

“…Although they reported on preform neck-down crystallization issues during the drawing, they achieved minimum losses of 3.05 dB/m at 405 nm after increasing the preform feed-rate and drawing speed [22]. They also showed that treatment of extruded preforms prior to fiber drawing further improved optical fiber loss to 0.5e1 dB/m [23].…”

“…Very few studies on the fabrication of fluorophosphate glass optical fibers have been reported in the literature [17,18,22,23]. Zou et al produced step-index fibers by drawing at the optical tower an ultra-highly pure core-cladding preform obtained by extrusion in the system P 2 O 5 eAlF 3 eYF 3 eMgF 2 eRF 2 eNaF, (R ¼ Mg, Ca, Sr and Ba).…”

Numerical Investigation of a Short Polarization Beam Splitter Based on Dual-Core Photonic Crystal Fiber with As2S3 Layer

“…During the drawing process, the preform was drawn into a PCF with the desired dimensions by precisely controlling drawing parameters such as the heat temperature, drawing and perform feed speed, and nitrogen (N 2 ) content. In order to ensure the quality of the PCF, the preform surface treatment steps need to be continuously implemented [ 50 ].…”

Highly Sensitive Plasmonic Sensor Based on a Dual-Side Polished Photonic Crystal Fiber for Component Content Sensing Applications

“…Fluoride phosphate (FP) glasses have various speciality optical fiber applications, including mid-IR lasers, UV transmission, and radiation dosimetry, of which N-FK51A soft glass is one of the most suitable types of glass for optical fibers [19]. Therefore, we select N-FK51A as the background material; its Sellmeier equation [20] can be given by:nFK51A2(λ)=1+A1λ2λ2−B1+A2λ2λ2−B2+A3λ2λ2−B3 where A 1 = 0.971247817, A 2 = 0.219014, A 3 = 0.9046517, B 1 = 0.00472302 μm 2 , B 2 = 0.01535756 μm 2 , B 3 = 168.68133 μm 2 , and λ is free space wavelength.…”