Patent ID: 7505487

Claim:
A laser oscillator comprising: a film containing a laser medium formed over a substrate, the film being interposed between an anode and a cathode; an optical resonator comprising a first reflector and a second reflector; and a pumping source for supplying pumping energy to the laser medium; wherein the laser medium comprises a luminescent layer, wherein the substrate, the anode, and the cathode are interposed between the second reflector and the first reflector which is in contact with the substrate, wherein the luminescent layer includes a phosphorescent material dispersed into a host material at a concentration such that the luminescent layer generates excimer emission, wherein the pumping source is electrically connected to the anode or the cathode, wherein the phosphorescent material is an organic metal complex, and wherein in luminescence of the phosphorescent material, light is amplified by the optical resonator.