Khan, Sultan (2025) Study on the Influence of SiO2 on Thermal, Mechanical and Thermo-optical Properties of Rare Earth Doped Alminophosphate Glass for High Average Power (HAP) Laser Application. PhD thesis, CSIR CGCRI and AcSIR.

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Abstract

This PhD thesis explores advancements in glass host materials for high-average-power (HAP) laser applications and environmentally sustainable commercial glass production. In Part A, the thermal, mechanical, thermo-optical and spectroscopic properties of silico-phosphate glasses are optimized through systematic compositional modifications. The incorporation of SiO₂ into BaO-Al₂O₃-P₂O₅ (Al2O3 ≥12.5 mol%) glasses enhances thermal conductivity, reduces the coefficient of thermal expansion, and increases fracture toughness while maintaining structural stability, despite a reduction in Yb³⁺ fluorescence lifetime. Further, modifying MgO-BaOAl₂O₃-P₂O₅-SiO₂ glasses with optimized oxygen-to-phosphorus (O/P) ratios and SiO2 content improves rigidity, fracture toughness, thermal expansion coefficient and hydration resistance, balancing gains in thermo-mechanical and thermo-optical properties against minor reductions in laser gain coefficients. Additionally, Er³⁺ and Yb³⁺/Er³⁺ co-doped silico-phosphate glasses exhibit efficient energy transfer mechanisms, stable structural integrity, and promising fluorescence lifetimes, particularly in compositions such as ABSP-M3(YbEr15), reinforcing their suitability for HAP applications. In Part B, the thesis addresses sustainability in industrial glass manufacturing by using boron-containing carbon-free minerals, such as colemanite and borax penta-hydrate, as alternative sources for CaO and Na₂O in soda lime silicate (SLS) glass. This approach significantly lowers the melting temperature by up to 500 °C, reducing energy consumption and CO₂ emissions while maintaining desirable glass properties, such as enhanced Vickers’ micro-hardness and lower thermal expansion coefficients. Together, the findings contribute to the development of high-performance laser glasses and sustainable, energyefficient glass production, addressing both technological and environmental challenges.

Item Type:	Thesis (PhD)
Additional Information:	Supervisor: Dr K Annapurna
Subjects:	Glass
Divisions:	Glass
Depositing User:	Ms Upasana Sahu
Date Deposited:	01 Sep 2025 11:29
Last Modified:	01 Sep 2025 11:29
URI:	http://cgcri.csircentral.net/id/eprint/5753

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