Design and modeling of compact high power fiber lasers
Highly-doped phosphate glasses provide significantly higher gain than regular silica doped glasses. We will discuss a novel design strategy for compact, high gain, double clad and photonic crystal fiber lasers and amplifiers. Modeling tools include higher order finite element-based vector modal solvers for passive and active single and multi-core devices, optical and thermal transport and mechanical stress calculations for high power laser operation.
In this study, the neutron emission rate from neutron sources using prompt gamma rays in hydrogen was determined, and several improvements were applied. Using Monte Carlo calculations, the best positions for the source, moderator and detector relative to each other were selected. For (241)Am-Be and (252)Cf sources, the sizes for polyethylene spheres with the highest efficiency were 12- and 10-inch, respectively. In addition, a new shielding cone was designed to account for scattered neutrons and gamma rays. The newly designed shielding cone, which is 45 cm in length, provided suitable attenuation for the source radiation.