U3+/LiYF4, a promising IR laser
نویسندگان
چکیده
Under reducing conditions, single crystal of LiYF4 doped with 762 ppm of u3+ were obtained. Absorption andfluorescence spectra of this system are presented as well as the energy level scheme of the lasing 4 4 transition. Oscillator strength and laser cross section between Stark levels of the + 19,2 transition are calculated.
منابع مشابه
Lanthanide-doped LiYF4 nanoparticles: Synthesis and multicolor upconversion tuning
We report the synthesis of tetragonal-phase LiYF4 nanoparticles doped with upconverting lanthanide ions. The nanoparticles have been characterized by XRD, TEM, and luminescence decay studies. The size of the as-synthesized LiYF4 nanoparticles can be tuned by varying the precursor ratio of F to lanthanide ions. Passivated by oleic acid ligands, the LiYF4 nanoparticles can be readily dispersed in...
متن کاملAnalysis of Heat Generation and Thermal Lensing in Erbium 3- m Lasers
The influence of energy-transfer upconversion (ETU) between neighboring ions in the upper and lower laser levels of erbium 3m continuous-wave lasers on heat generation and thermal lensing is investigated. It is shown that the multiphonon relaxations following each ETU process generate significant heat dissipation in the crystal. This undesired effect is an unavoidable consequence of the efficie...
متن کاملPossibilities and Limits of Avalanche Lasing on the Green Er3+:LiYF4 Transition
In computer simulations the population mechanisms of the room-temperature continuous-wave green upconversion E?+:LiYF4 laser are investigated. An avalanche process is the dominating excitation mechanism, but it also counteracts stimulated emission at higher dopant concentrations. This concentration dependence can be considered as a behaviour present in many rare-earth-doped avalanche lasers.
متن کاملThe synthesis and mechanism exploration of europium-doped LiYF4 micro-octahedron phosphors with multilevel interiors.
Multi-layered hollow LiYF4:Eu(3+) micro-octahedrons, with about 400 nm of single-layer thickness and 300 nm of interlayer space, have been synthesized via a facile hydrothermal route in the presence of surfactant ethylenediamine tetraacetic acid (EDTA). The mechanisms of the morphology evolution of the LiYF4:Eu micro-octahedrons are investigated in detail. Time-dependent experiments indicate th...
متن کاملA Strategy to enhance Eu3+ emission from LiYF4:Eu nanophosphors and green-to-orange multicolor tunable, transparent nanophosphor-polymer composites
LiYF4:Eu nanophosphors with a single tetragonal phase are synthesized, and various strategies to enhance the Eu(3+) emission from the nanophosphors are investigated. The optimized Eu(3+) concentration is 35 mol%, and the red emission peaks due to the (5)D0 →(7)FJ (J = 1 and 2) transitions of Eu(3+) ions are further enhanced by energy transfer from a sensitizer pair of Ce(3+) and Tb(3+). The tri...
متن کامل