A comparative study is presented of the laser output characteristics of ten fluorescent solutes in different solvents, pumped with the 337.1 nm radiation from a 200 kW nitrogen laser. With both 2 mm and 10 mm dye path lengths, peak output powers of several kilowatts were obtained at wavelengths ranging from 350 to 600 nm and with pulse-widths as short as 0.5 nsec FWH M. The dependence of the laser characteristics on such variables as the concentration and the transmission of the solutions and the way of focusing the exciting radiation into the dye cavity were investigated. Three dye cells were made to lase in cascade, one of the stages with an efficiency of 50%.

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A study is presented of the total differential Raman cross section for CO2, 02, CO, CH,, H20 and H2 relative to that of N2. The scattered radiation was collected perpendicularly to the excitation beam from a 337.1 nm nitrogen laser of 50 kW peak power. The short pulse with a duration of 2.5 ns was conveniently handled by a sampling oscilloscope. The sampling technique permits a smoothing process to be performed at the output of the sampling oscilloscope, which does not affect the time resolution, in order to improve the signal-to-noise ratio of the records of Raman spectra.

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