Mr. Subhabrata Ghosh Profile

Subhabrata Ghosh

at Indian Institute of Technology Kharagpur

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Proceedings Article | 17 May 2018 Paper

Effect of ZnO-HfO2 hybrid nanocrystals on amplified spontaneous emission in Eu-doped ternary glass-ceramic waveguides

Subhabrata Ghosh, Shivakiran N. Bhaktha

Proceedings Volume 10683, 106833N (2018) https://doi.org/10.1117/12.2315068

KEYWORDS: Nanocrystals, Waveguides, Optical amplifiers, Transmittance

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We discuss the fabrication of 1 mol% Eu-doped 70 SiO₂–(30-x) HfO₂–x ZnO (x = 0, 2, 5 and 7 mol%) ternary glass-ceramic waveguides, and the effect of ZnO–HfO₂ hybrid nanocrystals on the optical gain in Eu-doped ternary waveguides. Formation and growth of ZnO–HfO₂hybrid nanocrystals have been observed in the TEM images with increase of ZnO concentration in the samples. Waveguiding properties of Eu-doped ternary waveguides were measured using lab-built prism-coupling technique. Propagation losses of the waveguides were measured using photometric detection technique and found to be between (0.3 to 0.6)±0.2 dB/cm. We have further investigated the optical amplification of red emission line (⁵D₀ → ⁷F₂) of Eu-ions in these waveguides using the variable stripe length method wherein the waveguides were pumped by continuous wave 532 nm laser in a stripe-like geometry using cylindrical lens The optical gain coefficients are found to be 5.3, 4.8, 3.7 and 0.1 cm⁻¹ for ZnO concentration of 0, 2, 5 and 7 mol% respectively.

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