PROCEEDINGS • SPI E- The lntern ational Soc iety fo r Optical Engineering Xl/1/nternationa/ Symposium on Gas Flow and Chemical Lasers an d High-Power Laser Conference Antonio Lapucci Marco Ciofini Editors 18-22 September 2000 Florence , ltaly Organized by INOA- Italian National lnstitute of Applied Optics ENEA- Ente per le Nuove Tecnologie, l'Energia e l'Ambiente (ltaly) CNR- National Research Council (ltaly) Sponsored by European Office of Aerospace Resea rch and Development, Air Force Office of Sc ientific Research, U. S. Air Force R esea rch Laboratory SPIE- The lnternational Society for Optical Engineering EI.En. SpA (ltaly) Consorzio CEO-Centro di Ecce ll enza Optronica (ltaly) Volume 4184