Efficient KrF-laser pulse compression

The results of theoretical and experimental studies performed on pulse compression techniques for advanced ICF drivers are described. The first objective of this program was a detailed theoretical study of a pulse compression technique. The basis of the new technique is the use of linearly expanding beams as opposed to collimated beams in backward Raman pulse compressors. The expectation was that this new geometry would considerably enhance the compressor performance, especially with respect to the buildup of second Stokes parasitics. Detailed analysis and extensive computer simulations carried out as part of this program have shown, however, that the advantages are not as pronounced as expected, especially with respect to parasitic suppression.