Germanate-tellurite composite fibers with a high-contrast step-index design for nonlinear applications

Boivin, Mathieu; El-Amraoui, Mohammed; Ledemi, Yannick; Morency, Steeve; Vallée, Réal; Messaddeq, Younès

doi:10.1364/ome.4.001740

Cited by 23 publications

(25 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As mentioned in the introduction, an alternative method was implemented to produce the step-index fluorophosphate glass fibers. This method, which will be discussed in more details later, consists in two successive steps: (i) the fabrication of core-cladding preforms by the conventional build-in casting method [24,25] and; (ii) the drawing of the step-index fibers from the as-prepared preforms through a fused silica crucible. First, to prepare the core-cladding preforms, cylindrical glass tubes with the cladding composition [10Sr(PO 3 ) 2 -90(AlF 3 eCaF 2 eSrF 2 eMgF 2 )] were first prepared.…”

Section: Core-cladding Preform Preparation and Optical Fiber Drawingmentioning

confidence: 99%

“…Then, the glasses were re-melted under vacuum at 730 C for 1 h and poured into a cylindrical brass mold preheated at the glass transition temperature and annealed at the same temperature for 6 h. To produce the glass rods for the preform core, a cylindrical mold of 5 mm inner diameter was employed. To produce the glass tube for the preform cladding, a modified built-in casting technique was used [24]: (i) the glass is cast into the preheated mold of 10 mm inner diameter and begins to solidify in contact with the mold walls; (ii) a shutter placed below the mold is then opened, allowing the part of the glass which is still liquid (center of the cylinder) to flow away, forming a glass tube and; (iii) the same shutter is closed once the tube has solidified with the desired diameter and length.…”

Section: Core-cladding Preform Preparation and Optical Fiber Drawingmentioning

confidence: 99%

“…We optimized the fluoride/phosphate ratio content to achieve a highly transparent glass in the DUV region with a large thermal stability against crystallization for further fiber drawing. Core-cladding preforms were first prepared by a modified build-in casting method [24,25]. As we faced surface crystallization issues during fiber drawing from the preforms, an alternative fiber fabrication process was then implemented.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2017

Self Cite

View full text Add to dashboard Cite

a b s t r a c tIn this study, we report on the fabrication process of highly pure step-index fluorophosphate glass optical fibers by a modified crucible technique. High-purity fluorophosphate glasses based on 10 mol% of barium metaphosphate and 90 mol% of metal fluorides (AlF 3 eCaF 2 eMgF 2 eSrF 2 ) have been studied in order to produce step-index optical fibers transmitting in the deep-ultraviolet (DUV) region. The characteristic temperatures, viscosity around softening temperature and optical transmission in the UVevisible region of the prepared bulk glasses were characterized in a first step. The selected glass compositions were then used to prepare core-cladding optical preforms by using a modified built-in casting technique. While uncontrolled crystallization of the fiber was observed during the preform stretching by using the conventional method, we successfully obtained crystal-free fiber by using a modified crucible technique. In this alternative approach, the produced core-cladding preforms were inserted into a home-designed fused silica crucible assembly and heated at 643 C to allow glass flowing throughout the crucible, preventing the formation of crystals. Single index fluorophosphate glass fibers were fabricated following the same process as well. The optical attenuation at 244 nm and in the interval 350e1750 nm was measured on both single index and step-index optical fibers. Their potential for using in DUV applications is discussed.

show abstract

Section: Core-cladding Preform Preparation and Optical Fiber Drawingmentioning

confidence: 99%

Section: Core-cladding Preform Preparation and Optical Fiber Drawingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…Cross-section view of the PN step-index optical fiber observed with an optical microscope.As indicated by vertical dotted line inFigure 6(a), the refractive index difference between core (P5.7N4.3) and cladding (P6N4) is 0.02 at 633 nm, which corresponds to a numerical aperture of 0.25. This index profile difference is sufficiently to have optical confinement inside the core of the fiber[59]. In order to achieve a large numerical aperture (NA), a large difference of refractive indices between core and cladding must be arranged.…”

mentioning

confidence: 99%

Highly nonlinear Pb2P2O7-Nb2O5 glasses for optical fiber production

Manzani

Gualberto

Almeida

et al. 2016

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

In this study we present the production and characterization of Pb 2 P 2 O 7 -Nb 2 O 5 glasses and optical fibers. The dependence of Nb 2 O 5 content on thermal, structural and optical properties were investigated by thermal analysis (DSC), Raman spectroscopy, UV-Visible absorption, M-Lines and Z-scan techniques. Glass transition temperatures (T g ) increased linearly with Nb 2 O 5 content up to 60 mol %, while thermal stability against crystallization (T) reached a maximum value of 225 o C at 40 mol% of Nb 2 O 5 . Raman spectra showed a significant structural change by the insertion of NbO 6 octahedral units in the glass network. The increase of Nb 2 O 5 concentration shifts the glasses absorption edge to lower energies, and also increase the linear refractive indexes (n 0 ) due to the high polarizability of niobium atoms and formation of non-bridging oxygen. Similarly to n 0 , an increase in the positive values of nonlinear refractive indexes was observed using Z-Scan technique with increase of Nb 2 O 5 content, based on structural changes caused by the replacement of Pb 2 P 2 O 7 instead Nb 2 O 5 . The average of n 2 values at 500 -1500 nm raised from 2.2 × 10 -19 to 3.8 × 10 -19 m 2 /W, when the Nb 2 O 5 content was increased from 10 to 60 mol %. Lastly, a core-cladding preform was produced by suction method and the optical fiber drawn. The sample containing 40 mol% of Nb 2 O 5 was used for presenting the highest thermal stability against crystallization and n 0 values greater than 2 from green to near-infrared wavelengths. Multimode step index fiber with good core circularity and concentricity was produced and the optical losses were determined by cut-back method at visible and near-infrared ranges.3 IntroductionLead pyrophosphate glasses containing tungsten oxide in the binary system Pb 2 P 2 O 7 -WO 3 have already been investigated and shown interesting thermal and optical properties, resulting chemically stable, extremely high resistance against devitrification and high linear and nonlinear refractive indexes [1,2]. The optical properties were correlated with the specific phosphate glass network containing lead atoms and tungsten octahedrons. At high WO 3 contents the octahedrons WO 6 units linked together through W-O-W bonds to form highly polarizable clusters, which were pointed out to be responsible, in conjunction with lead atoms polarization, for high linear and nonlinear optical properties [2]. Besides the interesting optical properties, lead pyrophosphate glass present high vitrifying ability and unusual capability to dissolve large amounts of others glass formers, modifiers, or intermediate compounds without reduction of glass forming ability [3,4], as observed by the insertion of WO 6 inside the phosphate covalent network that form strong P-O-W bonds which are responsible to enhance the network connectivity [5]. Transparent phosphate glasses containing heavy metal oxides such as Bi 2 O 3 , Sb 2 O 3 , WO 3 , Nb 2 O 5 , and PbO are subject of intense studies and widely exploited as optical compone...

show abstract

“…These glasses usually transmit light from 0.4 to 6.0 µm, they have a relatively high nonlinear refractive index (∼20 times higher than that of silica) and they possess proper chemical, thermal and mechanical properties to be drawn into optical fibers [1][2][3][4][5]. Thus, numerous works about the generation of nonlinear effects in the mid-infrared, such as supercontinuum, with tellurite fibers are reported in the literature [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Advances in methods of purification and dispersion measurement applicable to tellurite-based glasses

Boivin¹,

El-Amraoui²,

Poliquin³

et al. 2016

Opt. Mater. Express

Self Cite

View full text Add to dashboard Cite

The intensity of the absorption bands due to the hydroxyl (OH) vibrations in the spectrum of tellurite glasses was decreased by using tellurium tetrachloride (TeCl 4 ) as a dehydrating additive. This additive is incorporated with the initial reagents of the glass. During synthesis, it reacts with the OH groups present in the glass melt by releasing gaseous hydrochloric acid. The low chloride content remaining in the different glasses after their synthesis negligibly modifies their thermal properties, their stability against crystallization, and their refractive index. Its low impact on the refractive index of the glasses was assessed in the mid-infrared thanks to an enhanced prism coupling system using a supercontinuum laser as light source.

show abstract

Germanate-tellurite composite fibers with a high-contrast step-index design for nonlinear applications

Cited by 23 publications

References 24 publications

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

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

Highly nonlinear Pb2P2O7-Nb2O5 glasses for optical fiber production

Advances in methods of purification and dispersion measurement applicable to tellurite-based glasses

Contact Info

Product

Resources

About