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absorption Advances in Quantum amplification Appl Applications Symposium April atomic Bell Telephone Laboratories Brooklyn Symposia Series Bull Calcium Fluoride cavity coherent light Columbia University Press crystal described dielectric diodes discussed effect efficiency energy levels equations excitation experimental Fabry-Perot interferometer February field fluorescence France frequency function GaAs He-Ne Helium-Neon IEEE infrared Institute of Brooklyn intensity ions J. R. Singer January Laboratories laser beam Laser Operation Laser Output Laser Pumping laser rod Lasers and Applications Lett Measurements microns microwave microwave phototube mirrors modes modulation Neodymium nonlinear observed obtained Ohio State University Optical Maser Action Optical Maser Oscillation Optical Pumping p-n junction Paris phototube Phys Polytechnic Institute population inversion Proc pulsed ruby Quantum Electronics radiation reported resonator ruby laser ruby optical maser Samarium Semiconductor solid-state laser spectral spikes stimulated emission studied Symposium on Quantum temperature theory Third International Symposium threshold tion transitions wave wavelength