Upconversion in Nd3+-doped glasses: Microscopic theory and spectroscopic measurements

Abstract

Infrared emissivity of tin upon release of a 25 GPa shock into a lithium fluoride window J. Appl. Phys. 110, 103510 (2011) Microcavity effects in SiGe/Si heterogeneous nanostructures prepared by electrochemical anodization of SiGe/Si multiple quantum wells J. Appl. Phys. 110, 103101 (2011) Microstructure, optical property, and electronic band structure of cuprous oxide thin films J. Appl. Phys. 110, 103503 (2011) Suppression of luminescence quenching at the nanometer scale in Gd2O3 doped with Eu3+ or Tb3+: Systematic comparison between nanometric and macroscopic samples of life-time, quantum yield, radiative and nonradiative decay rates J. Appl. Phys. 110, 094317 (2011) Influence of local atomic configuration in AlGdN phosphor thin films on deep ultra-violet luminescence intensity J. Appl. Phys. 110, 093108 (2011) Additional information on J. Appl. Phys. In this work, we report a systematic investigation of upconversion losses and their effects on fluorescence quantum efficiency and fractional thermal loading in Nd 3+ -doped fluoride glasses. The energy transfer upconversion ͑␥ up ͒ parameter, which describes upconversion losses, was experimentally determined using different methods: thermal lens ͑TL͒ technique and steady state luminescence ͑SSL͒ measurements. Additionally, the upconversion parameter was also obtained from energy transfer models and excited state absorption measurements. The results reveal that the microscopic treatment provided by the energy transfer models is similar to the macroscopic ones achieved from the TL and SSL measurements because similar ␥ up parameters were obtained. Besides, the achieved results also point out the migration-assisted energy transfer according to diffusion-limited regime rather than hopping regime as responsible for the upconversion losses in Nd-doped glasses.

High-gain Al2O3:Nd3+ channel waveguide amplifiers at 880 nm, 1060 nm, and 1330 nm

“…The total remaining power of pump and signal beams were each redistributed in a Gaussian profile before entering the next longitudinal propagation step. [6,25,26,[30][31][32][33][34] The experimentally determined spectroscopic parameters (Table 2) were used in the simulation. The population and propagation equations were solved using 128 longitudinal and 32 radial elements.…”

“…Figure 5b shows the averaged ETU parameter for seven Nd 3+ concentrations (open circles) and a linear fit. The ETU parameters at different Nd 3+ concentrations in various materials [6,25,26,[30][31][32][33][34] are also displayed in the same figure for comparison. Al 2 O 3 :Nd 3+ exhibits a higher ETU parameter than the majority of glass, polymer, and crystalline materials.…”

Comprehensive Rate Equation Analysis of Upconversion Luminescence Enhancement Due to BaCl2 Nanocrystals in Neodymium-Doped Fluorozirconate-Based Glass Ceramics

“…Table lists these processes together with their rate coefficients which have been determined by calculating the total ETU constant with the formula given by ref , and then distributed over the single processes by their relative weights with the overlap integrals. The ETU processes enter the rate equations for the level N 4 from which they originate as italic∂ t N ETU , 4 ( t ) = − 2 ∑ j A ETU , j N 4 2 and add to the receiving levels j like + A ETU, j N 4 2 .…”

Theoretical investigation of the more suitable rare earth to achieve high gain in waveguide based on silica containing silicon nanograins doped with either Nd^3+ or Er^3+ ions

“…The emission cross section of these transitions is equal to 10 −19 cm −2 [24] and correspond to linewidths ∆ω i j reported in Table 3. The up-conversion coefficient C up ranging from 1 × 10 −17 to 5 × 10 −17 cm 3 /s was found in [22,23]. This value leads to an equivalent lifetime τ up = 1 C up N 1 that remains 10 times larger than the longest level lifetime of Nd 3+ ions which allows neglecting the up-conversion process [7].…”