- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Investigations of physical parameters of Ge doped binary Se-As chalcogenide glassy alloys for optical fiber application
摘要： Germanium doped chalcogenide glasses have potential applications in non- linear and optoelectronic devices. Ternary Ge-Se-As system has been considered to study the different important physical parameters. The impact of deviation of Ge on the cost of As in Ge-Se-As glassy system has been discussed in terms of average coordination number, cohesive energy, heat of atomization, and the theoretical optical band gap of the system. Almost all the physical parameters are found to change linearly with the variation in Ge content. The physical properties approximated in the present study can reveal the structural details for optical fibers.
关键词： Chalcogenide glasses,cohesive energy,mean bond energy,glass transition temperature,lone pair electrons
更新于2025-09-16 10:30:52
-
Formation of Nanoparticles and Plasmonic Structures in Porous Materials Using Laser and SCF Technologies
摘要： A review of the authors’ studies on the processes of metal nanoparticles (silver and gold) formation and of various type structures in polymer and porous materials based on the effects of self-assembly and self-organization in the continuous laser radiation field is presented. Most experiments were performed either with samples saturated with metal precursors in supercritical carbon dioxide or with those exposed to this medium. Structures of various types from metal nanoparticles in polymers and porous glasses: periodic structures of micron and submicron scale, layered structures from nanoparticles with an unusually short period (about 90 nm), filament, ring structures, and island nanoparticle films have been synthesized. Several regularities and mechanisms of the formation of both the nanoparticles and their structures depending on the wavelength of laser radiation have been established. New results on the method for producing composite porous foam materials based on silver nanoparticles and polymer matrices, which combines laser-induced “drawing” of porous structures, their impregnation with precursor molecules using supercritical fluid technology, and subsequent reduction of nanoparticles are presented.
关键词： structures,porous glasses,polymers,carbon dioxide,supercritical fluid,nanoparticles,laser formation,self-assembly
更新于2025-09-16 10:30:52
-
AIP Conference Proceedings [AIP Publishing ADVANCES IN BASIC SCIENCE (ICABS 2019) - Bahal, India (7–9 February 2019)] ADVANCES IN BASIC SCIENCE (ICABS 2019) - Upconversion emission of Ag nanoparticles with Er3+/Yb3+ ions in tellurite glasses under 980nm laser excitation
摘要： The light upconversion in Er3+ - Yb3+ doped TeO2 -WO3- Li2O (TWLEY) doped glass containing silver nanoparticles (NPs) has been reported. Tellurite based glasses have been prepared by melt quenching technique with small amount Ag nanoparticles(NPs). The optical excitation is made at 980 nm in resonance with the 2F5/2→2F7/2 transition of Yb3+ ions in glass system. Intense emission bands centered at 525nm, 550nm, and 654 nm were observed corresponding to Er3+ ions transitions. Upconversion fluorescence Intensity of the glasses samples are also observed at 980nm femtosecond laser excitation using two photons microscope. For this green and red colour intensity measurement of the TWLEY with Ag NPs glass sample has been analyzed by intensity histograms. Results show that plasmon enhances upconversion of silver and rare-earth doped glasses may be utilized to explore its potential for multiphoton microscopy.
关键词： Tellurite glasses,Ag nanoparticles,Er3+/Yb3+ ions,980nm laser excitation,Upconversion emission
更新于2025-09-16 10:30:52
-
Europium-doped boro-telluro-dolomite glasses for red laser applications: Basic insight into spectroscopic traits
摘要： Naturally abundant minerals and lanthanide-doped synthetic boro-tellurite networks have become prospective efficient laser hosts because of the synergy between them. Driven by this idea, Eu3+-doped boro-telluro-dolomite (BTD) glasses were prepared via the melt-quenching method. The spectroscopic traits of as-quenched samples were analyzed though experimental and theoretical studies. The result from the derivation of absorption spectral fitting (DASF) model demonstrated the direct allowed transition in the glasses. Moreover, the photo-luminescence spectra of the sample containing 1.0 mol% of Eu3+ (BTD1.0Eu glass) revealed a prominent red peak at 611 nm (assigned to 5D0 → 7F2 transition in Eu3+ ion) with a large stimulated emission cross section (7.15 × 10?22 cm2) and a high luminescence branching ratio (61.5%). Furthermore, the attained CIE color coordinates (0.637, 0.363), which lie near the standard red hue (0.67, 0.33), together with high quantum efficiency (92.7%) affirmed the effectiveness of BTD1.0Eu glass as a potential red laser host.
关键词： Boro-telluro-dolomite glasses,Red emission,Europium ions,Judd–ofelt analysis,Radiative parameter,Optical band-gap energy
更新于2025-09-16 10:30:52
-
Chemical and structural heterogeneities in Nd-doped oxynitride phosphate laser glasses
摘要： The application of oxynitride glasses in optics has been limited due the issues inherent in their preparation that result in bubbles, metallic inclusions or opacity. Although the synthesis of oxynitride phosphates is easier than in silicates, due to their lower melt viscosity, the remaining water in the form of OH causes, for instance, the neodymium luminescence to be negatively affected. We report on the preparation of oxynitride Nd phosphate glasses that are submitted first to a dehydroxylation, so that their structure and properties can be studied as a function of the nitrogen content taking a completely homogeneous OH-free glass as the starting point of each synthesis. Raman and Brillouin Spectroscopy confirmed the segregation in oxide and N-enriched regions, and NMR of the glasses has been used to calculate the O/P ratio from the distribution of P(O,N)4 groups. The difference between this and the experimental one obtained from the elemental analyses confirms the segregation in oxide and oxynitride regions that is produced during the ammonolysis of the phosphate glass. The oxynitride glass network could thus be considered a non-homogeneous mixture of the oxide and the nitrided phases that are segregated due to the non-randomness of the nitridation reaction.
关键词： Nitridation,Phosphate glasses,Laser glasses,Oxynitride glasses,Water
更新于2025-09-12 10:27:22
-
Laser-induced optically modified Se <sub/>58</sub> Ge <sub/>27</sub> Pb <sub/>15</sub> and Se <sub/>58</sub> Ge <sub/>24</sub> Pb <sub/>18</sub> thin films
摘要： Amorphous samples of Se58Ge27Pb15 and Se58Ge24Pb18 glasses were prepared using the melt quenching method. Thin films of samples were deposited using the vacuum evaporation method. These films were illuminated with Nd: YAG 532 nm green laser radiation. The samples were structurally characterised using X-ray Diffraction (XRD) and Energy-dispersive X-ray analysis. XRD indicated an increase in the crystallinity of samples on laser irradiation. The samples were optically tested through absorption, reflection and transmission spectra recorded on UV-vis spectrophotometer. The obtained values of energy band gap, refractive index, extinction coefficient and Urbach energy of the films were compared both before and after laser exposure. Furthermore, it was found that sample thickness also changes on laser irradiation. The band gap of the samples was found to decrease laser irradiation in Se58Ge27Pb15thin films, while for Se58Ge24Pb18 thin film samples, an unexpected increase in band gap was observed at a laser irradiation time of 8 min. The variable behaviour of band gap has been explained on the basis of Mott and Davis model and heteropolar bond formation.
关键词： thin films,laser irradiation,Chalcogenide glasses,optical properties
更新于2025-09-12 10:27:22
-
A Study of Structure and Morphology of Bulk Metallic Glasses after Laser Beam Treatment
摘要： Recently, the Zr-based bulk metallic glasses (BMGs) have attracted attention because of their good glass-forming ability and excellent mechanical properties. The amorphous structure is thermodynamically unstable, and it tends to change into an equilibrium crystalline state. The objective of this work is to test the influence of the laser beam on the surface structure and morphology of BMGs with zirconium matrix. The material for the examination was Zr55Cu30Ni5Al10 alloy obtained by high-pressure copper mold casting method in the form of a plate in specified dimensions. In this paper, irradiation with single impulse and laser beam welding emitted in a pulsed mode which consists of a series of overlapping point interactions were used. Different parameters of the laser beam were employed. Microscopic observations proved that after laser treatment amorphous-crystalline structure appears in the heat-affected zone (HAZ). High-resolution transmission electron microscopy analysis of irradiated metallic glass showed that small amount of crystalline Zr2Ni-type phase was produced in the HAZ, whereas in the fusion zone and parent material amorphous structure appears. What is more, it has been observed that the higher laser beam frequency and energy the more weld penetration takes the shape of an ellipse.
关键词： Zr-based alloy,bulk metallic glasses,laser melting,surface morphology
更新于2025-09-12 10:27:22
-
A new whole family perovskites quantum dots (CsPbX3, X=Cl, Br, I) phosphate glasses with full spectral emissions
摘要： In this work, pure CsPbCl3, CsPbBr3 and CsPbI3 quantum-dots phosphate glasses were fabricated. Full spectrum (405-690nm) emissions in visible wavelength range are achieved via varying with the ratio of Cl, Br and I halogen elements in the prepared glass host. Compared with the television color standard of the National Television Systems Commission, a wider gamut, ranging from typical purple to red, has discovered in this machine glass system. Furthermore, the photoluminescence properties of quantum dots glasses are detected at high temperature and the exciton binding energy curves are fitted. The fitted results, exciton binding energy increases about six times than previous works, demonstrate that the photoluminescence mainly comes from the recombination of excitons, rather than the recombination of free electrons and holes. Thus, varieties of practical applications, like display devices and the newest light-emitting diodes, are expected to be driven forward.
关键词： Phosphate glasses,CsPbX3 (Cl, Br, I) quantum dots,Full spectrum
更新于2025-09-12 10:27:22
-
Effect of up-conversion luminescence in Er3+ doped phosphate glasses for developing Erbium-Doped Fibre Amplifiers (EDFA) and G-LED's
摘要： The (NPbPEr) glasses of the composition (20-x) Na2SO4-20PbO-60P2O5-xEr2O3 (x= 0.1, 0.3, 0.5, 0.7, 1.0 mol %) are synthesized by melt quenching process. The basic characterization studies like XRD and EDS have confirmed amorphous nature and contents of the samples. The spectroscopic studies viz., optical absorption, photoluminescence (PL) and decay profiles were carried out. The PL spectra exhibited an intense sharp green emission peak at 544 nm due to 4S3/2 → 4I15/2 transition of Er3+ ions both in down-conversion (DC, l exc = 377 nm) and up-conversion (UC, l exc = 977 nm) PL spectra. The spectra also exhibited a broad intense NIR band at 1532 nm ascribed to 4I13/2→4I15/2 transition of Er3+ ions at l exc = 977 nm. The analysis of the spectra indicated 0.5 mol% of Er2O3 is the optimal concentration for achieving maximal PL output both in the green and in NIR regions. The CIE color coordinates and the corresponding CCT (K) values were estimated from both UC and DC emission spectra. Overall analysis of the results suggested that the investigated glasses are potential candidates for getting intense green light emission and are quite suitable as optical fibre amplifiers in the green and NIR (around 1.5 m m) regions.
关键词： Er3+ ions,Green and NIR emission,sodium sulfo-phosphate glasses
更新于2025-09-12 10:27:22
-
AIP Conference Proceedings [AIP Publishing PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019 - Kerala, India (12–14 June 2019)] PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019 - Structural and optical studies of bismuth silicate oxyfluoride glasses for LED applications
摘要： The samples SBS20, SBS25 and SBS30 are prepared by traditional melt quenching method. The XRD pattern of prepared samples confirms the glassy nature and a broad peak at 2θ=280. The Raman spectra indicate that addition of SrF2 into the glass matrix leads to loosening of network. It will create more non- bridging oxygen in the samples. The Absorption spectra shows two peaks at 466 nm and 499 nm due to Bi2+ in different environments. The absorption edge shifted to lower wavelength with lower content of Bi2O3 due to the less amount of Bi3+ ion in the glass matrix. Optical band gap increases from 2.84eV to 2.86eV with increasing the SrF2 content leads to loosening of network. Emission spectra consist of three peaks at 435 nm, 510 nm and 630 nm, blue region is arising from Bi3+ and other two are from Bi2+. 20SBS and 25SBS show white light whereas 30SBS shows yellowish green in CIE diagram. The color purity and correlated color temperature are also calculated.
关键词： optical studies,structural studies,LED applications,bismuth silicate oxyfluoride glasses
更新于2025-09-12 10:27:22