Fluoride-Sulfophosphate/Silica Hybrid Fiber as a Platform for Optically Active Materials

Abstract

Pressure-assisted melt filling (PAMF) of prefabricated micro-capillaries has been proven an effective way of fabricating hybrid optical fiber (HOF) from unusual combinations of materials. Here, we extend the applicability of PAMF to multi-anionic fluoride-sulfophosphate (FPS) glasses. FPS glasses provide extended transmission windows and high solubility for various transition metal (TM) and rare earth (RE) ion species. Using PAMF for fabricating FPS/silica HOFs can therefore act as a platform for a broad variety of optically active fiber devices. For the present demonstration purposes, we selected Cr 3+-and Mn 2+-doped FPS. For both glasses, we demonstrate how the spectral characteristics of the bulk material persist also in the HOF. Using a double-core fiber structure in which waveguiding is conducted in a primary GeO 2-SiO 2 core, mode coupling to the secondary FPS-filled core allows one to exploit the optical activity of the doped FPS glass even when the intrinsic optical loss is high.

Glass: The carrier of light—Part II—A brief look into the future of optical fiber

“…Multimaterial or hybrid optical fibers now represent a fast‐growing subfield within fiber optics and are, unquestionably, amongst the most exciting from both a materials perspective and from a performance and application aspect. The field is too large to fully survey though the interested reader is directed to the reviews noted previously 50,246,247 . Here important advancements include new combinations of fiber materials and fabrication processes, 247‐250 integration of electrodes, 251 and other in‐fiber structures 252‐254 generally not possible in conventional glass systems.…”

“…The field is too large to fully survey though the interested reader is directed to the reviews noted previously. 50,246,247 Here important advancements include new combinations of fiber materials and fabrication processes, [247][248][249][250] integration of electrodes, 251 and other in-fiber structures [252][253][254] generally not possible in conventional glass systems.…”

Tunable broadband photoluminescence from bismuth‐doped calcium aluminum germanate glasses prepared in oxidizing atmosphere

“…Transition metal ions with their weakly bound d electrons (such as V 5+ , Ti 4+ , Cu + , Mn 2+ , Cr 4+ , Co 2+ , Ni 2+ , and Ag + ), [13][14][15][16][17][18][19][20][21] main group metal ions (such as Pb + , Sn 2+ , Bi 3+ , Te 4+ , and Sb 3+ ), [22][23][24][25][26][27][28] quantum dots (such as PbS 29 ), and structural defects (such as oxygen vacancies 30 ) present such alternatives. Among these, bismuth (Bi) ions are of particular interest due to their large variability in terms of the oxidation state that can be stabilized in glass matrices.…”

Role of Ag+ Ions in Determining Ce3+ Optical Properties in Fluorophosphate and Sulfophosphate Glasses

“…For example, it has been found that the glass-forming ability and corrosion resistance of phosphate glasses can be enhanced significantly through the introduction of sulfate anions (SO 4 2– ), − even though the glass structure was increasingly depolymerized when replacing P 2 O 5 by SO 3 . Similar relationships between glass structure and variations in anion content are of interest for understanding the properties of optically active ions doped into such materials, whereby the variation of anion species offers a range of new ligand configurations as compared to that of conventional phosphate glasses. ,− Furthermore, anion exchange may reduce the phonon energy such as in the prominent fluoride-phosphate (FP) glasses , and may also enhance the transmission window toward the deep blue or ultraviolet (UV) spectral range. ,− …”