Detection of gain enhancement in laser-induced fluorescence of rhodamine B lasing dye by silicon dioxide nanostructures-coated cavity

Abstract

In this work, nanostructured silicon dioxide films are deposited by closed-field unbalanced direct-current (DC) reactive magnetron sputtering technique on two sides of quartz cells containing rhodamine B dye dissolved in ethanol with 10^‒5 M concentration as a random gain medium. The preparation conditions are optimized to prepare highly pure SiO₂ nanostructures with a minimum particle size of about 20 nm. The effect of SiO₂ films as external cavity for the random gain medium is determined by the laser-induced fluorescence of this medium, and an increase of about 200% in intensity is observed after the deposition of nanostructured SiO₂ thin films on two sides of the dye cell.

Keywords

Silicon dioxide / nanostructures / gain enhancement / rhodamine B dye

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