Yb-Bi codoped magnesium germanate glasses were prepared. Their optical properties were investigated by absorption, luminescence spectra and luminescence decay lifetime and compared with single Bi-doped glass. The emission intensity of Yb-Bi codoped glass (MGBY) is ~10 times larger than that of single Bi-doped sample (MGB). The single-pass optical amplification was measured on a traditional two-...

Ho(3+)/Yb(3+) codoped glass ceramic was prepared by melt-quenching and subsequent thermal treatment. Under a 980 nm diode laser excitation, upconversion emissions from Ho(3+) ions centered at 540, 650, and 750 nm were greatly enhanced compared with those in the precursor glass. Especially, the short-wavelength upconversion emissions centered at 360, 385, 418, 445, and 485 nm were successfully o...

We have developed a modelisation of the Yb:Er glass laser system for pulsed regime. The model is first validated in CW regime with a good agreement with experimental values. The agreement in Q-switch mode is only qualitative. Nevertheless, tendences are outlined due to the particular dynamical behaviour of a codoped system. Especially, we pointed out the possibility of achieving Q-switch operat...

We have investigated magnetic Co atoms self-assembled on ultraflat stanene Cu(111) substrate by utilizing scanning tunneling microscopy/spectroscopy (STM/STS) in conjunction with density functional theory (DFT). By means of depositing onto the stanene/Cu(111) held at 80 K, developed into monomer, dimer, and trimer structures containing one, two, three atoms, respectively. As per atomically reso...

These lectures provide a phenomenological introduction to supersymmetry, concentrating on the minimal supersymmetric extension of the Standard Model (MSSM). In the first lecture, motivations are provided for thinking that supersymmetry might appear at the TeV scale, including the naturalness of the mass hierarchy, gauge unification and the probable mass of the Higgs boson. In the second lecture...

Elemental monolayers of the group 14 with a buckled honeycomb structure, namely silicene, germanene, stanene, and plumbene, are known to demonstrate spin splitting as result an electric field parallel their high symmetry axis which is capable tuning topological phase between quantum Hall insulator ordinary band insulator. We perform first-principles calculations based on density functional theo...

We theoretically investigate the quantum reflection of different atoms by two-dimensional (2D) materials graphene family (silicene, germanene, and stanene), subjected to an external electric field circularly polarized light. By using Lifshitz theory compute Casimir-Polder potential, which ensures that our predictions apply all regimes atom-2D surface distances, we demonstrate probability exhibi...

In this study, N, Scodoped titania photocatalyst was synthesized through an efficient and straight forward method using a single source, ammonium sulfate, as modification agent of titanium isopropoxide (TTIP) precursor. The catalyst was characterized by X-ray powder diffractometer (XRD), element Analysis of carbon, hydrogen, nitrogen (CHN), scanning electron microscopy (SEM), diffuse reflectanc...

We have demonstrated a self-starting, passively mode-locked Tm/Ho codoped fiber laser that lases at one of two center wavelengths. An amplified 1.56 μm distributed feedback laser pumps a ring laser cavity which contains 1 m of Tm/Ho codoped silica fiber. Mode locking is obtained via nonlinear polarization rotation using a c-band polarization sensitive isolator with two polarization controllers....

Abstract We present a way to dramatically accelerate Gaussian process models for interatomic force fields based on many-body kernels by mapping both forces and uncertainties onto functions of low-dimensional features. This allows automated active learning combining near-quantum accuracy, built-in uncertainty, constant cost evaluation that is comparable classical analytical models, capable simul...