A Study of Spectral and gain characteristics of substituted amino coumarins under nitrogen laser excitation

The absorption, fluorescence and ASE characteristics of three selectively s ubstituted coumarins(LD490,coumarin 540 and coumarin 535) have been investi gated in various polar and non-polar organic solvents. The ground state and excited state dipole moment of the dye molecules have been calculated usin g solvatochromic method. The excited state dipole moment of the rigid molec ule LD 490 is very high compared to the non regidised molecules. The gain c haracteristics of these dyes have been studied for various nitrogen laser p ower. (C) 1999 Elsevier Science B.V. All rights reserved.