Abstract
A tunable ultraviolet light source of high spectral brightness has been generated by frequency doubling of the emission of a flashlamp-pumped rhodamine 6G laser. Second harmonic generation (SHG) has been studied for different bandwidths of dye layer emission between 8 nm and < 10 -3 nm. When the beam spread of the laser was reduced by mode selection, peak power conversion efficiencies between 10% and 18% could be achieved for laser output powers as low as 15 to 25 kW. The influence of the spatial and spectral characteristics of the laser beam on the efficiency of SHG is discussed.
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