Bi-doped SiO2 as a new laser material for an intense laser

Investigations on bismuth and aluminum co-doped germanium oxide glasses for ultra-broadband optical amplification

“…The bigger the products, the better the bandwidth and gain properties of the amplifiers. The parameters of r em · FWHM and r em · s for the GAB glass are about 499 · 10 À20 cm 2 nm and 4.23 · 10 À24 cm 2 s, respectively, which are bigger than that for Er 3+ -doped silicate glass (r em · FWHM = 22 · 10 À20 cm 2 nm) [29], that for Cr-doped foresterite (r em · s = 2.85 · 10 À24 cm 2 s) [11] and that for Ti-doped sapphire (r em · s = 1.4 · 10 À24 cm 2 s) [6]. Therefore, it can be suggested from the above comparison that the Bi-and Al-co-doped germanium oxide glass might be the promising host material for the super-broadband amplifiers.…”

“…The stimulated emission cross-section (r em ) at 1280 nm was estimated to be 1.55 · 10 À20 cm 2 by Fü chtbauerLandenburg equation: r em ¼ k 4 8pn 2 cÁDk Á 1 s rad Á gðkÞ where k is wavelength, g(k) is the normalized spontaneous emission shape function, n is the host refractive index, c is light velocity, Dk is the FWHM of emission and s rad is the emission lifetime [11]. In this work, Dk = 322 nm, s rad = 273 ls and n = 1.6166, respectively for GAB glass.…”

Matrix effect on absorption and infrared fluorescence properties of Bi ions in oxide glasses

“…However Bi 3+ cannot emit the IR fluorescence [9]. Fujimoto et al [6,7] reported that the origin of IR fluorescence would be Bi 5+ . According to our results, higher valency state Bi 5+ would be impossible to form such reducing conditions: low basicity of matrix composition and high melting temperature.…”

“…On the other hand, Fujimoto et al [6,7] discovered that IR fluorescence of aluminosilicate glasses containing with the Bi 2 O 3 . This IR fluorescence shows broad bands around 1200 nm at room temperature without any crystalline phases.…”

Origin of near-IR luminescence in Bi_2O_3–GeO_2 and Bi_2O_3–SiO_2 glasses: first-principle study

“…The IR luminescence of bismuth centers discovered in Al 2 O 3 -SiO 2 :Bi glasses [1,2] has been observed in various glasses and crystals. Despite active studies of the bismuth-related IR luminescence (the present state of the art is reviewed in [3]) and successful applications for laser amplification and generation (see e.g.…”