One Meter KrF Laser System
Semi-annual rept. 23 Feb-22 Aug 1977
AVCO EVERETT RESEARCH LAB INC EVERETT MA
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This interim report covers research directed towards efficient high power UVvisible lasers. The key issues being addressed are 1 e-beam and e- beam controlled discharge excitation, 2 laser kinetics and modeling, 3 discharge stability and enhancement, 4 laser medium gain, adsorption and energy extraction and 5 intrinsic laser efficiency and scaling. Using e-beam controlled discharge pumping of a one meter KrF laser, 75 joules of laser output was obtained with 10 intrinsic efficiency at a specific energy of 10 Jliter. The use of an externally applied magnetic field to guide the e-beam is shown to effectively prevent e-beam steering by the discharge current and thus allow this excitation technique to be scaled to large laser apertures and very large single pulse energies. For efficient discharge pumping spatial e-beam energy deposition uniformity is shown to be important and methods of improving the deposition uniformity are proposed. Using pure e-beam excitation of XeF, a laser output of 36 joules was obtained with 2.6 intrinsic efficiency at a specific energy of 8 Jliter. Processes limiting XeF laser efficiency are identified and remedies proposed.
- Lasers and Masers