Laser oscillation around 200nm from argon ionic excimer (At2+Ar)2+ 23Pg(bound)-- 13Pu(repulsive) transition is reported for the first time. A 0.5 MeV 20KA 3Ons REB was employed to transversely pump the active media of pure argon. Kinetic process are analyzed numerically: The argon ionic excimer (Ar2+Ar)2+ is a potential laser media which should have wider tuning range than other type of ionic excimers. This broad band tuning character will be significant for practical uses. Using semiempirical Rittner, ab inito and scaling methode, A comprehensive compile of theoretical results for argon are given in fig.1
A newly observed laser induced collision (LIC) and anti-stokes frequency up-conversion process in He/Ne mixture is reported. The fluorescence emission line of Ne at 486.7 nm can be enhanced 3 - 4 times by applying both discharge and optical excitation. The result shows that the LIC process can be a major competitive process in the two step excitation process. Both experimental description and theoretical analyses are given.
Recently, there has been great interest in the two-step excitation for the generation of coherent XUV radiation with low pump threshold. The two-step excitation process is as follows: the energy is first stored in a metastable level, and subsequently converted into coherent XUV radiation by stimulated resonant anti-Stokes Raman scattering (SRASRS). The He/K mixture two-step pumping system was first proposed by V.O. Panpanyan et al., in 1983. The main kinetic process is that the He*(23 S) state is produced in a discharge. It makes use of strong collisional energy transfer from He* (23S) to populate potassium high lying quartet metastables K (3p53d4s4P5/2). By using 1.209 micrometers and 498 nm laser as the second step excitation, from the quartet state and through SRASRS the 64.3 nm and 59.8 nm coherent XUV radiation is obtained. This paper discusses several physical problems of the system.
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