Temperature dependent emission and absorption cross section of Yb^3+ doped yttrium lanthanum oxide (YLO) ceramic and its application in diode pumped amplifier

Abstract

Temperature dependent absorption and emission cross-sections of 5 at% Yb(3+) doped yttrium lanthanum oxide (Yb:YLO) ceramic between 80K and 300 K are presented. In addition, we report on the first demonstration of ns pulse amplification in Yb:YLO ceramic. A pulse energy of 102 mJ was extracted from a multi-pass amplifier setup. The amplification bandwidth at room temperature confirms the potential of Yb:YLO ceramic for broad bandwidth amplification at cryogenic temperatures.

Achieving photostability in dye-sensitized upconverting nanoparticles and their use in Fenton type photocatalysis

“…11 However, due to the forbidden nature of their intraconfigurational 4f-4f transitions, they have low absorption coefficients, leading to low upconversion efficiencies. 12 Consequently, the emission of light from LnUCNPs is commonly enhanced through an indirect sensitization technique involving an organic dye, known as the "antenna effect", [13][14][15][16] proposed by Weissman in 1942 to transfer energy from organic ligands to lanthanide ions. 17 Organic dyes possess considerably higher absorption crosssections (3-4 orders of magnitude higher than that of lanthanide ions) and feature broad and tunable absorption bands, making them ideal light-harvesting agents.…”

“…11 However, due to the forbidden nature of their intraconfigurational 4f–4f transitions, they have low absorption coefficients, leading to low upconversion efficiencies. 12 Consequently, the emission of light from LnUCNPs is commonly enhanced through an indirect sensitization technique involving an organic dye, known as the “antenna effect”, 13–16 proposed by Weissman in 1942 to transfer energy from organic ligands to lanthanide ions. 17…”

On the photostability and luminescence of dye-sensitized upconverting nanoparticles using modified IR820 dyes

“…This drawback is, in part, caused by the low absorption cross-section of lanthanide sensitizer ions (on the order of 10 −20 cm 2 in the NIR), usually based on the use of Yb 3+ as a sensitizer. 5 Furthermore, Yb 3+ is excited at 976 nm, which can cause significant heating of aqueous media. In contrast, Nd 3+ has been used as a sensitizer and has a narrow absorbance band at 800 nm, which does not induce heating of water, however it has a low absorption cross-section.…”