The system 2-amino-7-nitrofluorene/l,2-dichlorobenzene was found to show laser action. Contrary to hitherto known dye lasers this system exhibits a blue shift of the dye laser spectrum with increasing dye laser intensity, dye concentration and resonator Q. During emission of a single pulse, the dye laser spectrum shows a blue shift with proceeding time. These effects are explained by orientational relaxation processes of the polar solvent molecules.Das System 2-Amino-7-Nitrofluoren/l,2-Dichlorbenzol zeigt Ldserwirkung. Im Gegensatz zu bisher bekannten Farbstomasern zeigt dieses System eine Blauverschiebung des Laserspektrums mit zunehmender Farbstofflaserintensitit, Farbstofikonzentration und Resondtorgiite. Wahrend der Emission eines einzelnen Laserpulses erfolgt eine zeitliche Blauverschiebung des Farbstoflaserspektrums. Die genannten Effekte lassen sich durch Orientierungs-Relaxations-Prozesse der polaren Losungsmittelmolekule erklaren.
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