Object Oriented PIC codes with Upgraded Physics and Platfor

A novel technique for the processing of c-dopcd Yb-Er optical fiber cladding pumped lasers will be explored. If high power at 1550 nm is desired, it is advantageous to pump a c-dopcd Yb-Er fiber laser at 915 nm where there is a broad energy absorption band for Yb.. This energy is then resonantly transferred to the erbium co-dopant that provides the gain medium. in order to prevent back transfer from the excited Er to the ground state Yb. a rapid dc-excitation of the Er from this resonant level to the upper lasing level of the Er is required. This occurs most efficiently in a glass with a high phonon energy, i.e., a glass containing at least 10 mol % of ?205. Such a multicomponent silicate glass can be obtained through solution doping. or through the heating of a rare earth halide to provide a source the rare earth cations. However, these processing techniques can be problematic with regard to maintaining both high phosphorous levels and high rare earth content. A novel design of a high numerical aperture fiber has been proposed and realized. This is an all glass structure that avoids the possibility of any of the high power diode pump radiation interaction with polymeric coating material. In addition, multi-core fibers will be investigated by appropriate machining of preforms