LIQUID LASER ACTION AND THE IMPORTANCE OF CHEMICAL COMPOSITION IN RARE EARTH CHELATES
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Date
1964
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Ohio State University
Abstract
Laser action has been observed for low-temperature solutions of europium benzoylacetonate $(EuB_{3})$ at $6129 {\AA}$. The system displays typical laser behavior including relaxation oscillations, emission spikes, lifetime shortening and line narrowing. We have also investigated the effect of the detailed chemical composition of the chelate on its ability to lase. Depending on the method of synthesis and subsequent “purification” procedures, europium benzoylacetonate variants with various adduct groups such as $H_{2}O$, piperidine and extra ligand are obtained. These adducts change the emission spectrum and the ability to lase. For example, a pumping threshold of 600 joules is found for $EuB_{3}-HB-Piperidine$ in alcohol solution at $---150^{\circ}C$, whereas for bare $EuB_{3}$ and for $EuB_{3}-2H_{2}O1/_{2}NH_{3}$, no laser action was observed even at 3000 joules.
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Author Institution:TRW/Space Technology Laboratories,