Abstract
In this article, low hydroxide bismuth-germanate glasses doped with Er3+ and co-doped with Er3+/Yb3+ ions have been synthesized. The fabricated host was characterized by high thermal stability parameter (ΔT=125°C), high transmittance in mid-infrared region and low maximum phonon energy (724cm−1). In order to reduce OH− ions impact on the transmittance value at the band of 3.1μm, the modified synthesis process has been conducted in low vacuum conditions (50–70mbar). The wide transmittance window from 0.515 to 5.5μm has been determined in terms of optical parameters. Luminescent properties of Er3+ ions indicated increase of luminescence intensity at the wavelength of 2.7μm (4I11/2→4I13/2) under 980nm laser diode excitation resulting from OH− reduction. Simultaneously, the addition of ytterbium to glass system has increased emission intensity in mid-infrared band due to Yb3+→Er3+ energy transfer. According to mid-infrared luminescence measurements, molar ratio of co-dopants in developed glass matrix for the maximum emission intensity has been determined. Glass characterized by the highest mid-IR emission intensity has been used as the active core of produced optical fiber.
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