Advanced bismuth-doped lead-germanate glass for broadband optical gain devices

Abstract

We fabricated a series of glasses with the composition 94.7-GeO 2 -5Al 2 O 3 -0.3Bi 2 O 3 -PbO ͑ =0-24 mol. %͒. Characteristic absorption bands of bismuth centered at 500, 700, 800, and 1000 nm were observed. Adding PbO was found to decrease the strength of bismuth absorption. The addition of 3%-4% PbO resulted in a 50% increase in lifetime, a 20-fold increase in quantum efficiency, and a 28-fold increase in the product of emission cross section and lifetime on the 0% PbO composition. We propose that the 800 nm absorption band relates a different bismuth center than the other absorption bands.

Ultrabroad emission from a bismuth doped chalcogenide glass

“…When the excitation is 974 nm the peak shifts to 1350 nm. This is somewhat unusual since 974 nm excitation usually produces emission peaking at ~1100 nm in Bi doped glasses [4,[28][29][30]. The emission from 1020 nm excitation is exceptional since it results in the largest FWHM of 600 nm and it covers the entire telecommunications window, the spectra is also flattened over the O, E and S bands.…”

Towards a high-performance optical gain medium based on bismuth and aluminum co-doped germanate glass

“…The addition of 3-4% PbO resulted in a 50% increase in lifetime, a 20-fold increase in quantum efficiency, and a 28-fold increase in the product of emission cross section and lifetime on the 0% PbO composition, these measurements were made using 974 nm excitation. Based on these measurements and the glass quality we proposed that 6% was the optimum PbO content [14]. In this work we describe the optimization of the 0022-3093/$ -see front matter Ó 2009 Elsevier B.V. All rights reserved.…”

The effect of P2O5 on the ultra broadband near-infrared luminescence from bismuth-doped SiO2–Al2O3–CaO glass

“…In the present study, the opposite effect of P 2 O 5 addition on the two broad infrared emissions indicates that the infrared emissions at 1100 and 1300 nm may originate from different valence state Bi ion. A similar opinion was given for Bi doped lead-germanate glasses [25]. It is well known that Bi 2 O 3 will be converted to BiO or bismuth metal at high temperature [26].…”