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Title: Some new laser dyes: solvent effect on QE and lasing action

Abstract

With a view to extend the tunability range and maximum output with the coumarin series of dyes, eleven new coumarins differing in the nature of substituents and their positions are synthesized. Two of these are found to be capable of laser action. Optical spectra and quantum efficiencies of these two dyes in various solvents are studied. Correlation between lasing capability structure of the dye and its optical characteristics is discussed.

Authors:
; ;
Publication Date:
Research Org.:
Department of Chemical Technology, University of Bombay, Matunga, Bombay 400019, India
OSTI Identifier:
6651192
Resource Type:
Journal Article
Resource Relation:
Journal Name: Spectrosc. Lett.; (United States); Journal Volume: 15:8
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; COUMARIN; FLUORESCENCE; DYE LASERS; QUANTUM EFFICIENCY; SOLVENTS; ABSORPTION SPECTRA; EMISSION SPECTRA; TUNING; VISIBLE SPECTRA; EFFICIENCY; ESTERS; HETEROCYCLIC COMPOUNDS; LACTONES; LASERS; LIQUID LASERS; LUMINESCENCE; ORGANIC COMPOUNDS; ORGANIC OXYGEN COMPOUNDS; PYRANS; SPECTRA 420300* -- Engineering-- Lasers-- (-1989)

Citation Formats

Padhye, M.R., Varadarajan, T.S., and Deshpande, A.V. Some new laser dyes: solvent effect on QE and lasing action. United States: N. p., 1982. Web. doi:10.1080/00387018208068016.
Padhye, M.R., Varadarajan, T.S., & Deshpande, A.V. Some new laser dyes: solvent effect on QE and lasing action. United States. doi:10.1080/00387018208068016.
Padhye, M.R., Varadarajan, T.S., and Deshpande, A.V. 1982. "Some new laser dyes: solvent effect on QE and lasing action". United States. doi:10.1080/00387018208068016.
@article{osti_6651192,
title = {Some new laser dyes: solvent effect on QE and lasing action},
author = {Padhye, M.R. and Varadarajan, T.S. and Deshpande, A.V.},
abstractNote = {With a view to extend the tunability range and maximum output with the coumarin series of dyes, eleven new coumarins differing in the nature of substituents and their positions are synthesized. Two of these are found to be capable of laser action. Optical spectra and quantum efficiencies of these two dyes in various solvents are studied. Correlation between lasing capability structure of the dye and its optical characteristics is discussed.},
doi = {10.1080/00387018208068016},
journal = {Spectrosc. Lett.; (United States)},
number = ,
volume = 15:8,
place = {United States},
year = 1982,
month = 8
}
  • The mechanism of the temperature effect on the lasing and spectral characteristics of solutions of rhodamine, oxazine, polymethine, and some other dyes is studied experimentally. An important role is established for the variation of concentration ratios with temperature of different types of dye in solution in shaping the lasing characteristics of dye-based active liquids.
  • The energy per pulse as a function of wavelength was measured for several near-IR dyes (and dye mixtures) spanning the wavelength region from 650 to 950 nm using a 900 kW nitrogen laser (Molectron UV24) and a tunable dye laser-amplifier combination (Molectron DL14). The peak energy per pulse for each dye ranges from a low of 90 ..mu..J at 855 nm (DTTC) to a high of 350 ..mu..J at 702 nm (Oxazine 720P:Rhodamine 610P (1:1)). Several new near-IR dye mixtures are discussed that make it possible to tune from 660 to 940 nm without having the energy per pulse dropmore » below 50 ..mu..J. Pulse widths (FWHM) for HITC and IR 125 were measured at various wavelengths and were observed to vary by as much as 40 percent over the tuning ranges of the dyes.« less
  • Results of studies of the spectroluminescence and lasing characteristics of two new bifluorophoric laser dyes are given. The synthesized compounds are characterized by broader absorption and luminescence bands (..delta..lambdaapprox.240 nm) as compared to known compounds and allow us to achieve efficient lasing in the 530--610-nm spectral range. Study of the lasing characteristics of the new compounds is conducted in a dye laser with distributed feedback and excited by nitrogen laser radiation.
  • The lasing characteristics of several dye systems pumped by a pulsed, frequency doubled Nd/YAG laser are given in Table 1. The dyes and dye mixtures were pumped with 0.75 mJ pulses of 15 ns duration at a repetition rate of 13 Hz. (AIP)