Coumarins in the gaseous phase. II. Investigation of stimulated emission from coumarin vapors in the range 470–540 nm

An investigation was made of the spectral and time characteristics of lasers utilizing coumarin 7 (C7, C153, C30, 7-diethylamino-3(2'-benzoxazolyl)-coumarin, and C6 vapors mixed with buffer gases (~35 atm) and kept at 200 °C. The lasing efficiency in the region of 500 nm exceeded 6% and the threshold pump intensities were below 0.3 MW/cm², so that it should be possible to construct efficient cw and pulsed tunable gas lasers emitting in the blue-green part of the spectrum.