Absorption and emission properties of Tm2+ ions in germanosilicate glass fibers

Abstract

Absorption and emission properties between 350nm and 1600nm of the Tm2+ ions in optical fibers were investigated using the Tm2+-Tm3+ co-doped germanosilicate glass fibers and its fiber preform. Strong broad absorption band due to Tm2+ ions was found to appear from 350nm to ~900nm together with the absorption bands due to Tm3+ ions. Broad emission from ~600nm to ~1050nm and the other emission from ~1050nm to ~1300nm, which were not shown in the Tm3+ ions, were found upon the Ar ion laser pumping at 515nm. Both absorption and emission results confirm that the Tm2+ ions in the germanosilicate glass have the 4f-5d energy band from 350nm to ~900nm and the 4f-4f energy level at ~1115nm.

Synthesis and Luminescence Study of n‐UV Excitable Tm3+‐Activated Blue Phosphor

“…Tm 2+ exhibit a broad emission band spectrum in the spectral range 600–1050 nm due to the 5d‒4f transition and an emission band from 1050 to 1300 nm due to the 4f‒4f transition. [ 17 ] Thulium is incorporated in the exclusively trivalent form at La 3+ sites. Tm 3+ has [Xe] 4f 12 6s 2 electronic configuration with ground state 3 H 6 .…”

Formation of Tm2+ ions in germanosilicate glass optical fibers

“…The increase of Tm 3+ ions in the Fiber II is attributed to the high concentration of sucrose in the Solution II, which has increased the viscosity of the doping solution. In solution doping technique, the dopant concentration in a fiber core increases with the viscosity of a doping solution [14]. The additional broad absorption band from 350 to $900 nm is thought to be due to the incorporated Tm 2+ ions that have been reduced from the Tm 3+ ions in the core during the fiber preform manufacturing process.…”

Investigation of aluminum doped and aluminum thulium co-doped optical fibers for gamma radiation measurements

“…Aluminum-thulium co-doped fibers sensitivity is the highest in the range 490 nm -620 nm. Noisy data around 465 nm and 680 nm are not taken into consideration, they are due to absorption peaks of T m 3+ [7]. Oddly, the absorption peak at 795 nm does not lead to noisy data but to a flat RIA around this wavelength.…”