A5062842040- Glass properties and applications
- Phase-change materials and chalcogenides
- Material Dynamics and Properties
- Solid-state spectroscopy and crystallography
- Chalcogenide Semiconductor Thin Films
- Solid State Laser Technologies
- Pigment Synthesis and Properties
- Photonic Crystal and Fiber Optics
- Optical and Acousto-Optic Technologies
Indian Institute of Science Bangalore
2019-2024
University of Nottingham
2024
Abstract Rare-earth ion doped, silica glass, optical fibre amplifiers have transformed the world by enabling high speed communications and Internet. Fibre lasers, based on rare-earth doped glass fibres, achieve powers are exploited in machining, sensing medical surgery. However, chemical structure of fibres limits wavelength laser operation to < 2.5 µm, which excludes mid-infrared longer range 3–50 µm. doping fluoride glasses enables manufacture lasers up a limiting 3.92 µm wavelength,...
The present work describes the preparation of a new series chalcogenide glasses in an As14Sb26S(60−x) (AgI)x system intending to explore its thermal, structural, optical, mechanical, and electrical properties. differential scanning calorimetry results studied show sharp decrease glass transition temperature (Tg) with successive incremental inclusion AgI composition, implying structural changes network. A thorough Raman analysis corroborates occurrence network due formation AsI3 units Ag–S–As...
Thermal, optical, mechanical and structural studies were carried out on glasses in the pseudo-binary joint GeTe4-As2Se3 prepared by a melt quenching method. (GeTe4)100-x(As2Se3)x entire composition range of 0 ≤ x 100 have an average coordination number (Zav) = 2.4, where glass forming ability is found to be maximum. In general, for Zav transition dominated network connectivity chemical effects are minimal. Although Ge20Te80 (GeTe4) As2Se3 (As40Se60) GeTe4 poor former excellent former. The...
IR transmittingmaterials are required for remote detection of many biological molecules like water, ozone and carbon dioxide as their vibrational absorption bands between 3-5 8-12 µm. Te based chalcogenide glasses having low phonon energy high refractive index transmit the infrared light from 0.8 µm to 30 Ge-Se-Te prepared by melt quenching method found upto 25 These 75 % light. The glass forming ability thermal stability these difficult crystallize. ease formation along with transmission...
In this report, we investigate the optical properties of Se60-xTe40Sbx (0 ≤ x 12) chalcogenide glassy semiconductors using Diffuse Reflectance Spectroscopy (DRS) technique. From reflectance spectrum, absorption coefficient material is derived usingKubelka – Munk function. addition to this,the band gap calculated. Optical constants namely, extinction (k) and refractive index (n) are determined. Furthermore, other parameters such as conductivity, electrical susceptibility velocity light in...
(GeSe4)100-x (As2Se3)x glasses in the GeSe4-As2Se3 pseudo-binary joint are prepared by melt quenching method. In this tie-line, entire composition 0 ≤ x 100 is characterized fixed average network connectivity of 2.40, which considered to be an optimal as number constraints and degrees freedom available atoms balanced at connectivity. The glass forming ability having 2.40 usually found maximum. Glass transition temperature (Tg) decreases till = 30 remains invariant range 40 70. For > 70, Tg...