Abstract
A new laser oscillation of the FeI atom has been obtained on two lines in the visible region; 532.418 and 562.455 nm. A pulsed YAG laser for producing Fe vapor and a KrF laser for optically pumping Fe vapor are employed. When the YAG laser energy is 2.0 J/pulse and the KrF laser energy is 34 mJ/pulse, a maximum laser energy of 135.3 nJ and a maximum energy conversion efficiency ([Fe laser energy]/[KrF laser energy]) of 3.98×10 -4% are obtained. The optical gains at 532.418 and 562.455 nm are 0.66 and 0.41/cm, respectively. In order to elucidate the oscillation mechanisms of the visible Fe laser, output characteristics and temperature in the Fe vapor plasma are measured. As for the results, it is elucidated that the output characteristics of the visible Fe laser are mainly influenced by the temperature in the Fe vapor plasma.
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