Emission from Dyes in the Vapor Phase and the Possibility of Vapor-Phase Dye Lasers

Emission from vapor-phase Rhodamine B and Rubrene has been studied, using for excitation the line emission from argon and krypton ion lasers. Broad emission bands have been found for both vapors. The study suggests that in the temperature range 300–400°C rapid relaxation processes occur within the excited electronic level of Rubrene vapor, while these processes are slower for Rhodamine B. The emissivity per unit length of Rhodamine B and Rubrene were found to be approximately five times smaller than the corresponding emissivity of Rhodamine B solution, in the concentration range known to lase even under flashlamp excitation. From the study it is inferred that laser action should occur in these vapors.