caa a22 4500 445368756 CHVBK 20180317142939.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s00340-010-4287-0 doi (NATIONALLICENCE)springer-10.1007/s00340-010-4287-0 High efficiency dye laser with low fluorescence yield pyrromethene dyes: experimental and theoretical studies [Elektronische Daten] [K. Jagtap, D. Maity, A. Ray, K. Dasgupta, S. Ghosh] A combined experimental and theoretical study of the photo-physical, laser properties and molecular structures of three relatively recent Pyrromethene (PM) class dyes, PM597, PM580 and PM567, have been carried out. Laser characteristics of these three PM dyes were compared with three other widely used Rhodamine (RH) class dyes, RH6G, RHB and KRS, using a narrow-band dye laser setup, transversely pumped by the second harmonic (532 nm) of a Q-switched Nd-YAG laser. In addition to generating comparative data of these dyes for optimal use in dye lasers, we observed that unlike the RH dyes, the PM dyes show high efficiencies and wide tunability, despite the low fluorescence yield and high rate of non-radiative decay. Particularly, PM597 dye, in spite of a very low quantum yield of fluorescence (Φ=0.42), high non-radiative decay rate, and a large distortion from planarity in its excited state, when used in a laser cavity it exhibited similar laser efficiency and a beneficially wider tuning curve in comparison to other two PM dyes. Theoretical studies were carried out applying density functional theory and time-dependent density functional theory (DFT/TDDFT) to obtain new information on ground and the first excited state geometrical parameters of the PM dyes. Good correlation between calculated molecular properties and experimental results was observed for the evolution of the longest wavelength absorption maximum. Springer-Verlag, 2010 Jagtap K. Laser & Plasma Technology Division, Bhabha Atomic Research Centre, 400085, Mumbai, India aut Maity D. Theoretical Chemistry Section Bhabha Atomic Research Centre, 400085, Mumbai, India aut Ray A. Laser & Plasma Technology Division, Bhabha Atomic Research Centre, 400085, Mumbai, India aut Dasgupta K. Laser & Plasma Technology Division, Bhabha Atomic Research Centre, 400085, Mumbai, India aut Ghosh S. Theoretical Chemistry Section Bhabha Atomic Research Centre, 400085, Mumbai, India aut Applied Physics B Springer-Verlag 103/4(2011-06-01), 917-924 0946-2171 103:4<917 2011 103 340 https://doi.org/10.1007/s00340-010-4287-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-010-4287-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Jagtap K. Laser & Plasma Technology Division, Bhabha Atomic Research Centre, 400085, Mumbai, India aut NATIONALLICENCE 700 1- Maity D. Theoretical Chemistry Section Bhabha Atomic Research Centre, 400085, Mumbai, India aut NATIONALLICENCE 700 1- Ray A. Laser & Plasma Technology Division, Bhabha Atomic Research Centre, 400085, Mumbai, India aut NATIONALLICENCE 700 1- Dasgupta K. Laser & Plasma Technology Division, Bhabha Atomic Research Centre, 400085, Mumbai, India aut NATIONALLICENCE 700 1- Ghosh S. Theoretical Chemistry Section Bhabha Atomic Research Centre, 400085, Mumbai, India aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 103/4(2011-06-01), 917-924 0946-2171 103:4<917 2011 103 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer