Calculation of beam divergence of pulsed electron-beam-discharge lasers /EBL/
Abstract
The beam divergence in electron-beam-discharge lasers is determined by the refraction of the radiation by the gradients of the electron and gas densities. At short pump pulse durations (1 microsec or less) and, accordingly, at high charged-particle densities (about 10 to the 14th per cu cm) the divergence is due to the inhomogeneity of the ionization of the active medium. At long durations (greater than 10 microsec) the divergence is determined by the refraction of the radiation by the gas-density gradients produced by the hydrodynamic motion of the active medium during the course of the pump pulse. By using unstable telescopic resonators with dimensions smaller than the energy-input region, it is possible to considerably increase the energy of the radiation whose divergence is due to refraction.
- Publication:
-
Trudy Akademiia Nauk SSSR Fizicheskii Institut
- Pub Date:
- March 1981
- Bibcode:
- 1981TrSSR.116..181G
- Keywords:
-
- Beam Interactions;
- Carbon Dioxide Lasers;
- Electron Beams;
- Electron Pumping;
- Pulsed Lasers;
- Electron Density (Concentration);
- Gas Density;
- Lasing;
- Optical Resonators;
- Lasers and Masers