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We describe a series of measurements of absorption and la ser induced fluorescence using cells that contained cesium and rubidium and krypton as a bath gas. These studies showed strong blue wing absorption to the short wavelength side of the alkali atom D 2 lines due to collisionally formed Cs-Kr or Rb-Kr excimers. These studies indicate that these species may be appropriate candidates for optically excited Rb and Cs atomic lasers. Keywords: optically pumped alkali lasers, excimer absorption, photodisociation 1. INTRODUCTION For more than 30 years there has been interest in developing gas phase lasers based on the strong D-line radiation in alkali atoms. For example, White 1 observed amplified spontaneous emission at 589.6 nm from the Na D 1 -line (3p 2 P 1/2 : 3s 2 S 1/2 subsequent to photodissociation of NaI by the fifth harmonic of a Q-switched Nd:YAG laser (212.8 nm). The excitation wavelength connected the ground state of the NaI molecule to an excited state that had the excited Na 3p |
