Nonlinear reflection of laser radiation in Xe-containing dense gas mixtures and cryogenic solutions

Nonlinear reflection of focused laser radiation (222-413 nm, H2-SRS-converted depolarized XeCl-excimer laser output) in Xe-containing binary gas mixtures and cryogenic solutions was studied. The effect of strong enhancement of unsaturated reflectivity, especially pronounced and frequency selective for admixture of Cl, Br-substituted hydro-carbons (CF2Cl2, CF3Cl, CF3Br) was observed, whereas no effect was found when fluorides (CF3H, NF3) or oxygen were added. For linearly polarized (lambda) equals 308 nm radiation reflectivities increased twofold up to approximately 0.8 at the intensity approximately 5 (DOT) 1010 wt(DOT)cm-2. Nonlinear reflection at (lambda) equals 308 nm in low-temperature solutions of Xe (20% mol) in LAr (at 140 K) and LKr (at 170 K) was observed and analyzed. Close to second order pump intensity dependences of reflection, photo-acoustic signals and secondary emission were found.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.