Narrow-band tunable laser system for a lidar facility
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A unique ultraviolet laser system has been developed for a lidar intended to detect nitrogen oxide molecules in the atmosphere. The electric-discharge KrF laser system is capable of producing a highly coherent laser beam with practically the same energy over a spectral range of 247.5–249.5 nm. At the edge of the amplification band in the range 247.5–247.8 nm, the system produces a beam of energy 0.3 J, pulse duration 16 ns, and spectral line width 2 pm. Atmospheric sounding by using this beam with an energy density of 200 mJ/cm2 in the scattered signal has detected noise in the 226 and 236 nm bands whose intensity increases the laser beam pulse repetition rate and energy density.
KeywordsKrF laser laser radiation master oscillator amplifier scattered radiation lidar system
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