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.

Influence of laser and material parameters on two photon absorption in Rhodamine B and Rhodamine 6G solutions in MeOH

Optik ◽  
2019 ◽  
Vol 183 ◽  
pp. 835-841 ◽  
Author(s):  
Rabia Ahmad ◽  
M. Shahid Rafique ◽  
Ali Ajami ◽  
Shazia Bashir ◽  
Wolfgang Husinsky ◽  
...  
Keyword(s):  
Rhodamine B ◽  
Rhodamine 6G ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Material Parameters ◽  
Two Photon

NONLINEAR ABSORPTION AND OPTICAL LIMITING IN SOLUTIONS OF SOME RARE EARTH SUBSTITUTED PHTHALOCYANINES

2001 ◽  
Vol 10 (01) ◽  
pp. 113-121 ◽  
Author(s):  
K. P. UNNIKRISHNAN ◽  
JAYAN THOMAS ◽  
BINOY PAUL ◽  
ACHAMMA KURIAN ◽  
PRAMOD GOPINATH ◽  
...  
Keyword(s):  
Rare Earth ◽  
Absorption Coefficient ◽  
Nonlinear Absorption ◽  
Optical Limiting ◽  
Photon Absorption ◽  
Open Aperture ◽  
Pulse Excitation ◽  
Two Photon Absorption ◽  
Two Photon ◽  
532 Nm

Effective nonlinear absorption coefficient, β eff , of solutions of some rare earth substituted phthalocyanines (viz: Sm(Pc)2, Eu(Pc)2 and LaPc) was measured using open aperture Z-scan technique under nanosecond pulse excitation at 532 nm. The effect of nonlinear absorption on optical limiting in these samples was also investigated. Both nonlinear absorption and optical limiting phenomena in these samples are attributed to sequential two-photon absorption (STPA) process.

INVESTIGATION OF NEAR TWO-PHOTON RESONANCE OPTICAL NONLINEARITIES IN Ni(Ac)2[N-(8-QUINOLYL) PYRIDINE-2-CARBOXAMIDE] · 4H2O BY THE Z-SCAN TECHNIQUE

2003 ◽  
Vol 12 (01) ◽  
pp. 81-89 ◽  
Author(s):  
SHENG-LI GUO ◽  
HUI-TIAN WANG ◽  
N. B. MING ◽  
JUN-YONG ZHANG ◽  
ZHI-JIAN GUO
Keyword(s):  
Nonlinear Absorption ◽  
Nonlinear Refraction ◽  
Photon Absorption ◽  
Closed Aperture ◽  
Optical Nonlinearities ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Nonlinear Optical Absorption ◽  
532 Nm ◽  
Photon Resonance

We describe a modified Z-scan technique for the case when nonlinear refraction is accompanied by nonlinear absorption to separately evaluate the nonlinear refraction and the nonlinear absorption by performing straightforward measurements with the aperture removed. We divide the closed aperture (S < 1) normalized Z-scan by a scan with an open aperture (S = 1). With nanosecond scale at a 532 nm wavelength, we first measured the nonlinear optical absorption and refraction coefficients of a solution of Ni(Ac)2[N-(8-quinolyl) pyridine-2-carboxamide] · 4H2O by using the modified Z-scan technique. The nonlinear absorption originates from the near resonant two-photon absorption while the mechanism of the nonlinear refraction is the near resonant two-photon absorption transition enhancement. The linear increasing dependences of the optical nonlinearities on the incident irradiance arise from the population redistribution due to the near resonant two-photon absorption.

Surface-Enhanced Hyper-Raman Scattering Elucidates the Two-Photon Absorption Spectrum of Rhodamine 6G

2013 ◽  
Vol 117 (6) ◽  
pp. 3046-3054 ◽  
Author(s):  
Chris B. Milojevich ◽  
Daniel W. Silverstein ◽  
Lasse Jensen ◽  
Jon P. Camden
Keyword(s):  
Absorption Spectrum ◽  
Raman Scattering ◽  
Rhodamine 6G ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Surface Enhanced

STUDIES ON TWO-PHOTON ABSORPTION OF ANILINE USING THERMAL LENS EFFECT

2003 ◽  
Vol 12 (01) ◽  
pp. 75-80 ◽  
Author(s):  
ACHAMMA KURIAN ◽  
S. THOMAS LEE ◽  
K. P. UNNIKRISHNAN ◽  
D. SAJAN GEORGE ◽  
V. P. N. NAMPOORI ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Optical Parametric Oscillator ◽  
Thermal Lens ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Lens Effect ◽  
Two Photon ◽  
Optical Parametric ◽  
Source Studies ◽  
Thermal Lens Effect

Two-photon absorption spectrum of aniline is recorded using thermal lens effect with optical parametric oscillator as the pump source. Studies show that the two-photon absorption spectrum observed corresponds to 1A1 → 1B2 transition of aniline.

Observation of two-photon absorption in rhodamine 6G using photoacoustic technique

1990 ◽  
Vol 74 (5) ◽  
pp. 313-317 ◽  
Author(s):  
P. Sathy ◽  
Reji Philip ◽  
V.P.N. Nampoori ◽  
C.P.G. Vallabhan
Keyword(s):  
Rhodamine 6G ◽  
Photon Absorption ◽  
Photoacoustic Technique ◽  
Two Photon Absorption ◽  
Two Photon

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.

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