Calculation of some characteristics of stimulated emission from active media of lasers based on organic compounds

Quantum chemistry methods are used to calculate the cross section for stimulated emission σ ( ν ) and the Einstein coefficients B ( ν ) for several substituted forms of oxazole, oxadiazole, naphthalene, pyrene, and other molecules. It is shown that introduction of electron-donor and phenylethynyl substituents into molecules of heteroaromatic and aromatic compounds, respectively, increases considerably both σ ( ν ) and B ( ν ) and imparts lasing ability to nonlasing compounds. A criterion is established for the oscillator strength of an electronic transition which must be satisfied if a compound is to have the lasing ability.

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