REAL-TIME KNOWLEDGE OF CO2 c.w. LASER BEAM POWER AND SHOW-UP OF RETROACTION PHENOMENA DURING OPERATIONS ON METALLICAL MATERIALS J. F. COUTOULY, F. EWELÉ, T. MANDERSCHEID, J. MERLIN et J. J. SCHWARZJ. Phys. IV France, 01 C7 (1991) C7-171-C7-174DOI: https://doi.org/10.1051/jp4:1991745