The efficient generation of redshifted pulses from chirped femtosecond joule level Bessel beam pulses in gases is studied. The redshift spans from a few 100 cm⁻¹ to several 1000 cm⁻¹ corresponding to a shift of 50-500 nm for Nd:glass laser systems. The generated pulses have an almost perfect Gaussian beam profile insensitive of the pump beam profile, and are much shorter than the pump pulses.
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November 2002
Once identified, an illness is met or fought against by an appropriate therapy. The diverse use of water holds a significant place among the therapeutic means which had been developed in Western medicine ever since antiquity. The essay deals with one particular form of application, namely, the gush of water.
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