Optical properties of Er,Yb co-doped YAG transparent ceramics

Structural disorder-dependent upconversion in Er3+/Yb3+-doped calcium titanate

“…[11,12,14,15]. Based on the energy matching conditions and the quadratic dependence on excitation power, the possible upconversion mechanisms were achieved.…”

“…Upconversion is an anti-Stokes emission process that converts long-wavelength pump sources into short-wavelength emission. Usually only two-photon upconversion processes are observed, and the mechanism of these two-photon transitions has been extensively analyzed in Er/ Yb-codoped materials [11][12][13][14][15][16]. Yang et al [13] studied the reduction of upconversion emission in CaTiO 3 :Yb,Er, while Deren et al [17] showed upconversion emission in CaTiO 3 :…”

Phase Separation in Garnet Solid Solutions and its Effect on Optical Properties

“…The use of Y 3 Al 5 O 12 (YAG) doped with Er 3+ (YAG:Er 3+ ) is well established in applications such as planar waveguide amplifi ers, [ 1,2 ] near-infrared (NIR) lasers for biomedical use, [3][4][5][6][7] and up-conversion phosphors for IR detection by conversion to visible light. [8][9][10] The YAG:Er 3+ system has several absorption bands at around 490, 800, 970 and 1480 nm, [ 11,12 ] which allows the use of various pumping sources.…”

Microstructural Analysis of Polycrystalline Er:YAG using Automated Crystal Orientation Mapping

“…The precession angle can be increased to obtain a more kinematical diffraction pattern, but the probe will suffer from beam broadening and the resolution of the map will degrade. For that reason, is important to find a balance between these two variables [1]. In this work, the diffraction patterns were recorded every 5 nm in an automated way by scanning the precessed beam 0.3° at 50 Hz along the sample over an area of 3.5 µm x 2.1 µm under nanobeam diffraction (NBD) conditions using a nominal spot size of 2.0 nm.…”

“…This behavior relies on the crystal operating in a quasi-three-level system, which leads to strong temperature dependence and a strong up-conversion process, which is dopant concentration dependent. [1] To evaluate the microstructure of these ceramic materials, electro-transparent sample preparation was performed by Focus Ion Beam (FIB), Zeiss Crossbeam 340, working with 30, 5 and 2kV gallium ions. The crystalline structure of the lamella was studied using a Scanning/Transmission Electron Microscopy (S/TEM) JEOL ARM 200F microscope operating at 200 kV equipped with an ASTAR system capable of perform Scanning Precession Electron Diffraction (S-PED), for crystal orientation mapping of the Er:YAG sample.…”