Article
Materials Science, Multidisciplinary
G. Pullaiah, K. Venkata Rao, B. C. Jamalaiah, N. Madhu, Venkatramaiah Nutalapati
Summary: Different concentrations of Ce3+-doped TWGCe glasses were prepared and characterized. The glasses emitted intense blue luminescence when excited at 323 nm radiation, making them suitable as blue light sources in the design of phosphor-based white LEDs.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ting Lan, Tiantian Han, Daguo Jiang, Yufeng Wen, Xin-Yuan Sun, Zhehao Hua, Sen Qian, Huiyun Ban, Hua Cai, Jifeng Han, Hui Liu, Shan Liu, Lishuang Ma, Laishun Qin, Jing Ren, Gao Tang, Zhigang Wang, ZhiLe Wang, Yao Zhu
Summary: The structural and luminescent properties of Eu3+-doped TeO2-GeO2-BaO scintillation glasses were studied. The results showed that an increase in TeO2 content led to a decrease in luminescent intensity and a slight increase in density. Therefore, a balance between luminescent efficiency and density requirement is necessary for scintillation applications.
Article
Chemistry, Physical
Gharam A. Alharshan, Z. A. Alrowaili, Ali H. Alomari, Imed Boukhris, Canel Eke, I. O. Olarinoye, M. S. Al-Buriahi
Summary: The ionizing radiation attenuation parameters of Li2O-SiO2 and Li2O-SiO2-GeO2 glasses doped with Y2O3 and In2O3 were estimated and analyzed. The shielding potentials of the glasses for gamma-rays, charged particles, and neutrons were explored. The results showed that the glasses had effective shielding abilities and could be viable alternative shields in nuclear radiation applications.
RADIATION PHYSICS AND CHEMISTRY
(2023)
Article
Materials Science, Ceramics
G. Pullaiah, K. Venkata Rao, B. C. Jamalaiah, A. Surya Narayana Reddy
Summary: Different concentrations of Er3+ ions doped TeO2-WO3-GeO2 glassy materials were fabricated and analyzed through various techniques. The glasses showed intense green luminescence and were suitable for designing green emitting solid state lighting devices.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Optics
Naoki Kawano, Kenji Shinozaki, Takumi Kato, Daichi Onoda, Yuma Takebuchi, Hiroyuki Fukushima, Takayuki Yanagida
Summary: In this study, Eu2O3-doped tellurite glasses were fabricated and their scintillation characteristics under visible light and X-ray irradiation were investigated. The quantum yield and scintillation intensity of the glass increased with the concentration of Eu2O3, while the afterglow levels decreased. The 5.0% Eu2O3-doped glass exhibited the highest quantum yield and a low afterglow level, comparable to that of Tl-doped CsI.
JOURNAL OF LUMINESCENCE
(2022)
Article
Engineering, Electrical & Electronic
Jia Ke, Zeng Jiahui, Han Tiantian, Yu Juntao, Wu Miaochun, Cheng Xi, Wen Yufeng, Sun Xinyuan
Summary: Dy3+-doped, Tb3+-doped and Tb3+/Dy3+ codoped tellurium-germanium-barium (TeO2-GeO2-BaO) glasses were prepared and their luminescent performances were systematically studied. The efficient energy transfer process from Dy3+ to Tb3+ ions was observed. The developed TeO2-GeO2-BaO glass, with high density, short decay time and high transmittance, is of significance for scintillation application in detection of high-energy rays.
LASER & OPTOELECTRONICS PROGRESS
(2022)
Article
Optics
P. Sailaja, Sk Mahamuda, K. Swapna, M. Venkateswarlu, A. S. Rao
Summary: This paper reports on the preparation and characterization of Neodymium (Nd3+) ions doped Oxy Chloro Boro Tellurite (OCBT) glasses. The influence of Nd3+ ions concentration on the physical, absorption, emission, and decay properties of OCBT glasses were investigated. The study provides valuable information on the radiative properties and quantum efficiency of the glasses, demonstrating the potential applications in solid state lasers technology and other laser applications.
OPTICS AND LASER TECHNOLOGY
(2022)
Review
Chemistry, Multidisciplinary
Galina Nemova
Summary: This review discusses the optical refrigeration of rare-earth-doped low-phonon micro- and nanocrystals using anti-Stokes fluorescence. Hybrid optical refrigeration, which suppresses both the translational and internal vibrational thermal energy of the particles, is presented as the latest achievement. Laser cooling of nanoparticles is a promising tool for fundamental quantum-mechanical studies, nonequilibrium thermodynamics, and precision measurements of forces.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Ceramics
M. Sukhanov, A. P. Velmuzhov, P. A. Otopkova, L. A. Ketkova, I. I. Evdokimov, A. E. Kurganova, V. G. Plotnichenko, V. S. Shiryaev
Summary: The influence of elemental and heterophase impurities on the optical and emission properties of doped chalcogenide glasses in rare-earth elements (Ce, Pr, Nd, Tb, and Dy) has been determined. The main impurities in REEs include transition metals, non-metals, gas-forming impurities, and inclusions. Heterogeneous inclusions originating from REEs contribute the most to optical losses in doped chalcogenide glasses.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Chemistry, Physical
Magdalena Lesniak, Jakub Zeid, Bartlomiej Starzyk, Marcin Kochanowicz, Marta Kuwik, Jacek Zmojda, Piotr Miluski, Agata Baranowska, Jan Dorosz, Wojciech Pisarski, Joanna Pisarska, Dominik Dorosz
Summary: This study presents an analysis of the TeO2/GeO2 molar ratio in an oxide glass system. The influence of germanium oxide content on various properties of the glass, including transition temperature, refractive index, and photoluminescence spectra, was investigated. Structural studies were conducted to explain the optical features observed in the glass.
Article
Materials Science, Ceramics
V. O. Kozlov, I. I. Ryzhov, G. G. Kozlov, E. V. Kolobkova, V. S. Zapasskii
Summary: We report the first direct observation of spontaneous fluctuations of birefringence in glasses doped with rare-earth ions. The fluctuations were observed as polarization noise of the laser beam transmitted through the sample in the region of the rare-earth ion absorption. The discovered effect provides a new experimental approach to studying low-temperature structural dynamics and interactions of impurities with the environment in such media.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Ceramics
Jose Henrique Faleiro, Noelio O. Dantas, Anielle C. A. Silva, Helliomar P. Barbosa, Bruno H. S. T. da Silva, Karmel de O. Lima, Guilherme de Freitas Silva, Rogeria Rocha Gonsalves, Rodrigo Falci, Younes Messadeq, Isabela Dias de Oliveira Branco, Bianca M. Cerrutti, Henrik Bradtmueller, Hellmut Eckert, Jefferson Luis Ferrari
Summary: The characteristics of rare earth (RE3+) doped phosphate glasses with different dopants were studied. The glasses were characterized by optical reflectance, Raman scattering, and solid-state NMR spectroscopy. Incorporation of Nb2O5 affected the optical and physical properties of the glasses, while having little impact on the emission properties of RE3+. These glasses may serve as potential candidates for energy conversion from infrared or UV to the visible region and as infrared solid-state emitters.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Xiaoxue Ma, Yukun Chen, Yi Liu, Xing Zhang, Shengwei Chi, Taiyu Jin, Haishuo Wu, Dawei Fang, Jun Wang
Summary: A study on a light-conversion glass doped with rare-earth ions was conducted to improve the light utilization and lifespan of silicon solar cells. Experimental results showed that this glass can increase the relative efficiency of silicon solar cells, demonstrating its important role in enhancing energy efficiency.
Article
Chemistry, Inorganic & Nuclear
Joydeb Biswas, Samar Jana, Sourav Ghosh, Venkataramanan Mahalingam
Summary: The spectroscopic and structural characteristics of Sm2O3 doped strontium lead zinc phospho-tellurite glasses with different concentrations have been investigated. The absorption spectra show intense bands at 400 nm and 1220 nm. The Judd-Ofelt intensity parameters are evaluated from the absorption measurements, revealing the radiative and lasing parameters. The luminescence spectra exhibit a strong emission band at 598 nm, corresponding to the 4G5/2 -> 6H7/2 transition. Luminescence concentration quenching and reduction of decay lifetimes are observed at higher concentrations due to enhanced nonradiative energy losses. The glasses demonstrate high quantum efficiency and stimulated emission cross-section, making them suitable for reddish-orange color emitting lasers.
SOLID STATE SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
I Kashif, A. Ratep
Summary: The study investigated the optical properties of multi former oxide glasses doped with different concentrations of Dy3+, aiming for white light-emitting application. Through XRD, FTIR, and optical characterization, the glasses were found suitable for optical applications with emissions in blue, yellow, and red. Additionally, radiative emission transition probabilities, color coordinates, and correlated color temperature were analyzed to determine the suitability of the glasses for white light emission.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Optics
T. Toney Fernandez, Simon Gross, Alexander Arriola, Karen Privat, Michael J. Withford
Article
Engineering, Environmental
Lidia Escudero-Castejon, James Taylor, Sergio Sanchez-Segado, Animesh Jha
Summary: A novel reduction reaction has been demonstrated for extracting Cr2O3 from chromite ores, excluding the formation of carcinogenic chromate intermediates. The process chemistry allows for the formation of high-purity Cr2O3 through high-temperature reduction and subsequent separation and leaching processes. This innovative extraction method shows potential for replacing current oxidative processes in chromite ore processing, reducing environmental pollution.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Toney T. Fernandez, Simon Gross, Karen Privat, Benjamin Johnston, Michael Withford
Summary: The intentional inclusion of key atomic elements in purpose-designed glass allows for unprecedented control over ultrafast laser written circular waveguide morphology and refractive index change. Factors such as viscosity, aluminum to alkaline earth+alkali ratio, and total silicon content within the glass are crucial in producing waveguides with high circularity and refractive index change. Drawing on this knowledge, a designer glass has been successfully fabricated to maintain circular waveguide morphology, high refractive index, and amorphous composition even at fast feed rates.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Correction
Optics
James Bolton, Animesh Jha
JOURNAL OF LUMINESCENCE
(2021)
Article
Engineering, Chemical
Steven Ghambi, Sergio Sanchez-Segado, Vitalis Chipakwe, Animesh Jha
Summary: This research introduces a novel chemical process for the extraction and refining of columbite and tantalite concentrates, resulting in a purified mixture of oxides of Nb2O5 and Ta2O5. By reducing and magnetically separating iron oxides in the concentrates, the process successfully reclaim alkali complex formed during the roasting process as a purified mixture of Nb2O5 and Ta2O5 oxides.
MINERALS ENGINEERING
(2021)
Article
Optics
Saurabh Bhardwaj, Toney Teddy Fernandez, Simon Gross, Michael J. Withford, Michael J. Steel
Summary: This study investigates the morphology of femtosecond laser, single pulse-inscribed, point-by-point fiber Bragg gratings. The refractive index profile of a point-by-point grating is directly measured using micro-reflectivity analysis. The grating is imaged at a sub-micrometer scale using scanning electron microscopy, and Raman and photoluminescence studies are conducted to probe the structural and electronic changes. The results from different characterization techniques suggest that the creation of an increased refractive index region around the micro-void is due to contributions from both densification and the formation of highly polarizable non-bridging oxygen bonds.
Article
Materials Science, Multidisciplinary
Yuchen Wang, Toney T. Fernandez, Pinghua Tang, Nicola Coluccelli, Stuart D. Jackson, Mario C. Falconi, Francesco Prudenzano, Paolo Laporta, Gianluca Galzerano
Summary: This study comprehensively characterizes the tunable continuous-wave and passive Q-switching laser performance of Dy-doped zirconium fluoride fiber emitting at around 3 μm. The optimal pump wavelengths, fiber lengths, output coupling efficiencies, and cavity parameters are determined, leading to high laser slope efficiency and a wide tuning range. Passively Q-switched laser operation is achieved using a semiconductor saturable absorber mirror, demonstrating stable operation and high pulse energy.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Multidisciplinary Sciences
Neelam Iqbal, Antonios Anastasiou, Zabeada Aslam, El Mostafa Raif, Thuy Do, Peter Giannoudis, Animesh Jha
Summary: Bone healing is a complex process that requires careful management to prevent negative outcomes. In the face of decreasing antibiotic effectiveness, alternative treatments like nanoparticles are receiving increased attention. Cerium oxide nanoparticles with a higher Ce3+ ion content showed enhanced antibacterial efficacy in the study.
SCIENTIFIC REPORTS
(2021)
Article
Nanoscience & Nanotechnology
T. Toney Fernandez, Simon Gross, Alexander Arriola, Karen Privet, Michael J. Withford
Summary: The aluminum to alkaline earth ratio (Al:[AE]) in borosilicate glass is a novel compositional parameter for producing high index waveguides through femtosecond laser inscription. Contrary to existing belief, high index waveguides can be fabricated by tuning the Al:[AE] ratio while keeping the absolute concentration of the index provider to a minimum.
Article
Multidisciplinary Sciences
Toney T. Fernandez, B. Johnston, S. Gross, S. Cozic, M. Poulain, H. Mahmodi, I Kabakova, M. Withford, A. Fuerbach
Summary: Zirconium fluoride glass has been re-designed to fabricate high index-contrast low-loss waveguides using femtosecond laser direct writing. This opens the door for the fabrication of mid-infrared integrated photonic devices.
SCIENTIFIC REPORTS
(2022)
Article
Optics
T. Toney Fernandez, B. Johnston, H. Mahmodi, K. Privat, I. Kabakova, S. Gross, M. Withford, A. Fuerbach
Summary: The femtosecond laser direct write technique was used to fabricate mid-infrared compatible waveguide couplers with high stability and high refractive index change, providing possibilities for the development of fully integrated and temperature-stable systems in the mid-infrared spectral range.
Article
Optics
Yan Ososkov, Jinho Lee, Toney T. Fernandez, Alex Fuerbach, Stuart D. Jackson
Summary: We demonstrate the high-efficiency operation of a dysprosium-doped fluoroindate glass fiber laser at 3.05 μm, which is pumped at 2.83 μm using an erbium-doped fluorozirconate glass fiber laser. The free-running laser achieves a slope efficiency of 82%, close to the Stokes efficiency limit. We achieve narrow-linewidth wavelength stabilization at 3.2 μm by utilizing a high-reflectivity fiber Bragg grating inscribed in the dysprosium-doped fluoroindate glass. These results open up possibilities for power-scaling of mid-infrared fiber lasers using fluoroindate glass.
Article
Chemistry, Physical
Sergio Sanchez-Segado, Sebastien Lectez, Animesh Jha, Stephen Stackhouse
Summary: Rare earth elements play a crucial role in driving the global transition towards a greener economy, but their production methods are not considered environmentally friendly. Researchers have applied various methods to estimate the enthalpy of formation of rare earth compounds, with the linear relationship and group contribution method proposed by the authors showing the highest accuracy. The volume based thermodynamics (VBT) method requires correction for improved accuracy, providing options for calculating the enthalpy of formation depending on available experimental data and desired accuracy.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Robotics
Manish Chauhan, James H. Chandler, Animesh Jha, Venkataraman Subramaniam, Keith L. Obstein, Pietro Valdastri
Summary: Soft pneumatic actuators have been explored for endoscopic applications, with challenges in fabricating complex shapes and maintaining compliance. The proposed corrugated design offers a solution to radial expansion issues and enables successful integration of endoscopic cameras.
FRONTIERS IN ROBOTICS AND AI
(2021)
Proceedings Paper
Astronomy & Astrophysics
S. Gross, T. Gretzinger, A. Arriola, G. Douglass, A. Ross-Adams, T. T. Fernandez, M. J. Withford
ADVANCES IN OPTICAL ASTRONOMICAL INSTRUMENTATION 2019
(2020)