scholarly journals Studies on Fluorescence Efficiency and Photodegradation of Rhodamine 6G Doped PMMA Using a Dual Beam Thermal Lens Technique

2002 ◽  
Vol 20 (2-4) ◽  
pp. 99-110 ◽  
Author(s):  
Achamma Kurian ◽  
Nibu A. George ◽  
Binoy Paul ◽  
V. P. N. Nampoori ◽  
C. P. G. Vallabhan
Keyword(s):  
Thermal Lens ◽  
Fluorescence Quantum Yield ◽  
Laser Excitation ◽  
Rhodamine 6G ◽  
Fluorescence Emission ◽  
Concentration Quenching ◽  
Dye Molecules ◽  
Dual Beam ◽  
Fluorescence Efficiency ◽  
Absolute Fluorescence

In this paper we report the use of the dual beam thermal lens technique as a quantitative method to determine absolute fluorescence quantum efficiency and concentration quenching of fluorescence emission from rhodamine 6G doped Poly(methyl methacrylate) (PMMA), prepared with different concentrations of the dye. A comparison of the present data with that reported in the literature indicates that the observed variation of fluorescence quantum yield with respect to the dye concentration follows a similar profile as in the earlier reported observations on rhodamine 6G in solution. The photodegradation of the dye molecules under cw laser excitation is also studied using the present method.

SOLVENT EFFECT ON ABSOLUTE FLUORESCENCE QUANTUM YIELD OF RHODAMINE 6G DETERMINED USING TRANSIENT THERMAL LENS TECHNIQUE

1999 ◽  
Vol 13 (16) ◽  
pp. 563-576 ◽  
Author(s):  
C. V. BINDHU ◽  
S. S. HARILAL ◽  
V. P. N. NAMPOORI ◽  
C. P. G. VALLABHAN
Keyword(s):  
Quantum Yield ◽  
Thermal Lens ◽  
Fluorescence Quantum Yield ◽  
Rhodamine 6G ◽  
Excited State Absorption ◽  
Fluorescence Yield ◽  
Dual Beam ◽  
Yield Values ◽  
Transient Thermal ◽  
Absolute Fluorescence

Dual beam thermal lens technique is successfully employed for the determination of absolute fluorescence quantum yield of rhodamine 6G laser dye in different solvents. A 532 nm radiation from a Q-switched Nd:YAG laser was used for the excitation purpose. The fluorescence quantum yield values are found to be strongly influenced by environmental effects. It has been observed that fluorescence yield is greater for rhodamine 6G in ethylene glycol system than in water or in methanol. Our results also indicate that parameters like concentration of the dye solution, aggregate formation and excited state absorption affect the absolute values of fluorescence yield significantly.

Measurement of the absolute fluorescence quantum yield of rhodamine B solution using a dual-beam thermal lens technique

1996 ◽  
Vol 29 (4) ◽  
pp. 1074-1079 ◽  
Author(s):  
C V Bindhu ◽  
S S Harilal ◽  
Geetha K Varier ◽  
Riju C Issac ◽  
V P N Nampoori ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Rhodamine B ◽  
Thermal Lens ◽  
Fluorescence Quantum Yield ◽  
Dual Beam ◽  
The Absolute ◽  
Absolute Fluorescence

scholarly journals Experimental Investigations on the Thermal Diffusion Characteristics and Photoluminescence in Multiphase Micro Fluids Containing ZnO Micro Tubes and Fluorescein Dye-=SUP=-*-=/SUP=-

2020 ◽  
Vol 128 (12) ◽  
pp. 1933
Author(s):  
Francis Frincy ◽  
E.I. Anila ◽  
Ani Joseph Santhi
Keyword(s):  
Thermal Diffusion ◽  
Thermal Lens ◽  
Heat Diffusion ◽  
Experimental Investigations ◽  
Dual Beam ◽  
Diffusion Characteristics ◽  
Fluorescence Efficiency ◽  
Lasing Medium ◽  
Growth Method ◽  
Fluorescein Dye

Scattering of light by disordered structures is normally detrimental to their applicability in many optoelectronic devices. However, some micro and nanostructures are useful in enhancing several optical and thermal properties like emission, heat diffusion etc. For this purpose, we have optimized the low temperature hydrothermal growth method for the ZnO micro tubes which leads to the growth of ZnO as mono dispersed micro tubes. Further, these samples were used to enhance the fluorescence efficiency of disordered media consisting of micro tubes of ZnO and fluorescein dye and to optimize the thermal diffusion of the mixture which will help us optimize the composition of these microscopic inclusions in designing a random lasing medium. Dual beam thermal lens method was used for this purpose. Keywords: thermal lens, thermal fluidics, thermal diffusivity, ZnO micro tubes, fluorescein.

Two and Three Photon Absorption in Rhodamine 6G Methanol Solutions Using Pulsed Thermal Lens Technique

1998 ◽  
Vol 07 (04) ◽  
pp. 531-538 ◽  
Author(s):  
C. V. Bindhu ◽  
S. S. Harilal ◽  
Achamma Kurian ◽  
V. P. N. Nampoori ◽  
C. P. G. Vallabhan
Keyword(s):  
Thermal Lens ◽  
Rhodamine 6G ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Dual Beam ◽  
Methanol Solutions ◽  
Thermal Lens Signal ◽  
Transient Thermal ◽  
532 Nm

Dual beam transient thermal lens studies were carried out in rhodamine 6G methanol solutions using 532 nm pulses from a frequency doubled Nd:YAG laser. Analysis of thermal lens signal shows the existence of different nonlinear processes like two photon absorption and three photon absorption phenomena along with one photon absorption. Concentration of the dye in the solution has been found to influence the occurrence of the different processes in a significant way.

STUDY OF ENERGY TRANSFER IN ORGANIC DYE PAIRS USING THERMAL LENS TECHNIQUE

2001 ◽  
Vol 10 (04) ◽  
pp. 415-421 ◽  
Author(s):  
ACHAMMA KURIAN ◽  
K. P. UNNIKRISHNAN ◽  
PRAMOD GOPINATH ◽  
V. P. N. NAMPOORI ◽  
C. P. G. VALLABHAN
Keyword(s):  
Energy Transfer ◽  
Thermal Lens ◽  
Transfer Rate ◽  
Rhodamine 6G ◽  
Dipole Interaction ◽  
Organic Dye ◽  
Energy Transfer Rate ◽  
Transfer Processes ◽  
Dual Beam ◽  
Resonance Transfer

It is demonstrated that the dual beam thermal lens technique can be very effectively used for the study of energy transfer processes in organic dye mixtures. The energy transfer rate and critical transfer radius in Rhodamine 6G — Rhodamine B are calculated using this technique. The observed results support Forster type resonance transfer due to long-range dipole–dipole interaction as reported by earlier workers using other techniques.

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