Porous−wall BeO capillary waveguide laser

Abstract

Small−bore capillary tubes exhibit very high optical gains and saturation intensities in flowing gas CO2 systems. However, these parameters may vary greatly in the axial direction due to the nonuniform axial pressure distribution. Use of porous−wall BeO capillary tubes makes it possible to attain a more uniform pressure distribution and to usefully scale capillary waveguide amplifiers to longer lengths.