PHOTOPHYSICAL PROPERTIES AND LASER CHARACTERISTICS OF A NEW RIGID AMINOCOUMARIN DYE LASING IN THE BLUE-GREEN REGION

被引：3

作者：

RAJU, BB ^{[1
]}

VARADARAJAN, TS ^{[1
]}

机构：

[1] INST CHEM TECHNOL, PHYS SECT, BOMBAY 400019, INDIA

来源：

APPLIED PHYSICS B-LASERS AND OPTICS | 1994年 / 59卷 / 01期

关键词：

42.55.Mv; 82.50;

D O I：

10.1007/BF01081731

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The photophysical properties of a new dye, 7-Diethyl AminoCoumarin with a Rigid substitution in the 3-position (referred to as DARC) have been studied in three solvents: dioxane, DMF and DMSO. The dye has been found to have a fluorescence quantum efficiency (phi(fl)) between 0.40 and 0.80 in these solvents. The dye-laser performance of this dye has also been investigated in dioxane, DMF and DMSO, under nitrogen-laser pumping and compared with that of the commercially available standard laser dye, Coumarin 515 (C-515). A tuning range of nearly 70 nm was obtained in the blue-green region with an efficiency up to 80% of that of the standard dye. The observed characteristics of the dye are explained in terms of the sructural rigidization of the dye in the 3-position which inhibits the formation of the Twisted Intramolecular Charge Transfer (TICT) conformation in the excited state leading to an enhancement of the phi(fl) and a considerable improvement in the laser performance.

引用

页码：83 / 86

页数：4