Imitrines. III. Laser action in the 500 nm band in solutions and vapors of organic dyes in the imitrine class

Laser action has been achieved in solutions of nine new organic dyes in the imidazotriazine (imitrine) class excited by the third (355 nm) harmonic of a neodymium laser. The free-lasing spectra covered the 485–546 nm range and the lasing efficiency was up to 17%. Laser action in the 470 and 525 nm ranges was obtained in imitrine 3 and imitrine 9 vapors.