Evolution of silica-based highly nonlinear fibers for FWM-based wavelength conversion application
Recent progresses on silica-based highly nonlinear fibers for practical FWM-based applications such as wavelength conversion efficiency enhancement and chromatic dispersion design are described, and then functional wavelength conversions using the fibers are demonstrated.
Silica-based highly nonlinear fiber with /spl gamma/ = 30/W/km and its FWM-based conversion efficiency
Silica-based highly nonlinear fiber with a record-breaking /spl gamma/ of 30 /W/km has been fabricated. FWM-based conversion efficiency was evaluated and we have confirmed that the new fiber shows the highest efficiency among fibers composed of various materials.
Long Ceramic Beam Tubes for Accelerator Magnets
The ceramic beam tubes for the fast and abort kickers and the bucker and pinger magnets used at Fermilab must meet a number of exacting requirements. The tubes must be long and sufficiently straight so as not to limit magnet design. They must have wall strength capable of withstanding the atmospheric and mechanical forces encountered during construction and operation. Vacuum tight ceramic to stainless steel transitions must be of reasonable cost; they must also withstand high temperature processing and remain vacuum tight to the 10/sup -9/ Torr range. To remove the possibility of static charge buildup each tube must have a surface coating of indium oxide applied to the inner wall. This thin coating is difficult to achieve and requires the most careful attention to detail. The methods used at Fermilab to achieve these goals are presented in this paper.