A5010129796- Glass properties and applications
- Phase-change materials and chalcogenides
- Luminescence Properties of Advanced Materials
- Chalcogenide Semiconductor Thin Films
- Nuclear materials and radiation effects
- Solid State Laser Technologies
- Solid-state spectroscopy and crystallography
- Crystal Structures and Properties
- Nonlinear Optical Materials Studies
- Photonic and Optical Devices
- Advanced Semiconductor Detectors and Materials
- Material Dynamics and Properties
- Photorefractive and Nonlinear Optics
- Optical and Acousto-Optic Technologies
- Material Science and Thermodynamics
- Liquid Crystal Research Advancements
- Nanomaterials and Printing Technologies
- Advanced Sensor and Energy Harvesting Materials
- Lanthanide and Transition Metal Complexes
- High-pressure geophysics and materials
- Quantum Dots Synthesis And Properties
- Radiation Therapy and Dosimetry
- Polymer crystallization and properties
- Laser Material Processing Techniques
- Advanced Materials Characterization Techniques
University of Saskatchewan
2005-2020
Plovdiv University
2014-2020
DZP Technologies (United Kingdom)
2014
Bulgarian Academy of Sciences
1999
There is a special need to develop dosimetry technique with large‐dynamic range and high‐spatial resolution characterize the microstructured X‐ray beams used in microbeam radiation therapy ( MRT ) for cancer. We report synthesis characterization of oxyfluoride glass‐ceramic (SiO 2 –Al O 3 –CaF –CaO–SmF plates, which contain trivalent‐samarium‐doped calcium fluoride (CaF :Sm 3+ nanocrystals, use as dosimetric detector material, particularly applications. Our approach utilizes extent Sm →Sm 2+...
Abstract Microbeam Radiation Therapy (MRT) is a synchrotron based technique for cancer treatment. During MRT tumours are irradiated with micro‐planar arrays of synchrotron‐generated X‐rays. The quality assurance such depends on the accurate measurement very high dose levels (>1000 Gy) together precise distribution over scale few microns. For applications we need to have dynamic range, high‐dose detector spatial resolution. As part work towards development examined X‐ray radiation induced...
Photodarkening of amorphous As2Se3 thin films was generated by a 633-nm HeNe laser. The refractive index and absorption coefficient the chalcogenide glass determined, both before after exposure, analyzing material's transmission spectrum. In order to accurately determine optical constants, film's non-uniform thickness accounted for. increase in investigated found demonstrate saturation with increased exposure time. Index changes as high 0.05, or 2%, were obtained As2Se3, promising for...
Bragg gratings are used in several photonic devices to reflect, and thus isolate, specific wavelengths of light. Gratings can be photoinduced chalcogenide glasses by illumination bandgap light an interference pattern. We holographic interferometry create amorphous As2Se3 thin films with a period 0.56 microm 633-nm The quality the was tested real time, refractive-index modulations as high 0.037 were measured. These found stable over months if they kept dark.
Inorganic materials doped with rare earth (RE) ions are an object of intense research due to their optical and electrical properties. These have the potential for various applications, such as solid-state lasers, active planar waveguides, fiber amplifiers, light-emitting diodes (LEDs), displays, ink fillers, security features, etc. RE trivalent can emit light from ultraviolet (UV) near-infrared (NIR) regions electronic transitions 4f-5d levels. Yttrium borate europium was prepared by...
We have investigated the photoluminescence (PL) emission spectra, lifetimes, and relative intensities of various Er-doped chalcogenide glass alloys, designed for possible use in optical waveguide amplifier applications at telecommunications wavelength 1550 nm. Bulk samples were prepared using melt-quenching techniques, doped with varying amounts Er2S3 or ErCl3, range 0.3−3 at. %. Using a 980 nm pump beam, we measured lifetime (4I13/2 to I15/24) luminescence PL spectra. For two efficiency as...
We studied the photoluminescence characteristics and thermal properties of Er-doped As-Se-Ga-Ge based chalcogenide glasses alloyed with different amounts Ge (1 to 15 at. %) for use as optical amplifiers at 1550 nm operation. used a 980 laser diode optically excite glass samples. The pumping induced output signal. measured lifetime exited Er state in these function doping up 3 %, composition from 1 %. also carried out Temperature-Modulated Differential Scanning Calorimetry measurements study...
Amorphous selenium (a-Se) is currently used in x-ray image detectors as an photoconductor. Normally a-Se films device applications are fabricated by the evaporation of vitreous bulk material loaded into boats a typical vacuum deposition system. The resistance against crystallization important factor both film and forms a-Se. Previous work has indicted that to surprisingly more pronounced around 35 °C [1]. In this we have therefore examined essential thermal properties (99.999%) samples been...