Broadband infrared luminescence from Li2O-Al2O3-ZnO-SiO2 glasses doped with Bi2O3

Abstract

The broadband emission in the 1.2~1.6mum region from Li2O-Al2O3-ZnO-SiO2 ( LAZS ) glass codoped with 0.01mol.%Cr2O3 and 1.0mol.%Bi2O3 when pumped by the 808nm laser at room temperature is not initiated from Cr4+ ions, but from bismuth, which is remarkably different from the results reported by Batchelor et al. The broad ~1300nm emission from Bi2O3-containing LAZS glasses possesses a FWHM ( Full Width at Half Maximum ) more than 250nm and a fluorescent lifetime longer than 500mus when excited by the 808nm laser. These glasses might have the potential applications in the broadly tunable lasers and the broadband fiber amplifiers.

Superbroad near-to-mid-infrared luminescence from Bi_5 ^3+ in Bi_5(AlCl_4)_3

“…Luminescence occurs over a wide spectral range from 1000 to 1700nm 35]. Absorption and emission schemes show a clear dependence on host composition [1,2,6,7,[9][10][11][12][13][14][15][16][17]35,36]. The emission lifetime at room temperature typically ranges from hundreds of microseconds to several milliseconds.…”

“…This has been primarily due to the material's intriguing spectral properties, especially superbroadband photoemission in the telecom spectral range, which currently cannot be obtained in traditional rare-earth based materials [1,[3][4][5]7,8]. Reports on basic materials properties and corresponding optical devices have convincingly proven the potential for application in superbroad optical amplifiers for future telecommunication networks and laser sources [1][2][3][4][5][6][7][8][9][10][11][12][13][14] . For example, addition of specific amounts of reducing agents such as carbon powder or gaseous hydrogen to Bi-containing glass batches was observed to enhance NIR emission of the corresponding glasses [ 1 8].…”

“…When trivalent bismuth ions are used as starting materials to produce glasses at high temperature, they are typically reduced during the melting process, forming, e.g., Bi [1][2][3][4][5][6][7][9][10][11][12]. In this case, emission from cluster ions plays only a minor role or is obscured by the comparably much longer lifetime of the former species.…”

NIR luminescence from Er–Yb, Bi–Yb and Bi–Nd codoped germanate glasses for optical amplification

“…Although a large number of emission lines have been observed to date, only the 1.06 m band has found widespread commercial applications. In the past few years, subsequent research on bismuth related near-infrared (NIR) photoluminescence (PL) has been reported in different glass host materials [8][9][10][11][12][13][14]. In all cases, the reported luminescence is centered at 1.2 m wavelength with full width at half maximum (FWHM) from 200 nm to nearly 400 nm.…”

Bismuth-doped glass microsphere lasers

“…The center of the emission bands is located at 1280 nm, and the FWHM of the emissions is about 270 nm. The ultrabroadband emissions have been attributed to electronic transitions of low valence Bi or Bi clusters [30][31][32][33], but the exact origin would need further investigation. Furthermore, when excited at 808 nm, the ultrabroadband emission intensity of Bi first increases as the doping concentration of Bi 2 O 3 is increased, reaching a maximum at 3.5 mol% Bi 2 O 3 doping, and then decreases when the Bi 2 O 3 content is further increased.…”