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Experiments were performed to detect LASER oscillations at 3u and at 7M. from cesium vapor optically pumped with light from helium clscharge lamps. No oscillations were observed. Fluorescence measureP ments have led to the construction of an improved system. Work was carried out on several possible LASER media utilizing collisions of the second kind in a gas discharge. Studies of the spacial and temporal behavior of the ruby (R line) LASER was investigated and crystal boules of calcium tungstate conta5.ning various concentrations of rare-earth ions ^ were grown., Crcillation was attempted, unsuccessfully in each of these jf schemes. Studies of crystal perfection indicate that the internal quality of these crystals is not yet adequate. Two new forms of the L Fabry-Perot interferometer have been constructedj which are superior in adjustment tolerances. Several aspects of the optical behavior of Fabry-Perot interferometers which are of importance for the understanding of F.P. LASERs have been studied theoretically. TECHNICAL RESEARCH GROUP