Measurement of relaxation times of NH in atmospheric pressure flames using picosecond pump-probe degenerate four-wave mixing

1999 ◽  
Vol 480-481 ◽  
pp. 307-310 ◽  
Author(s):  
J. Tobai ◽  
T. Dreier
Keyword(s):  
Atmospheric Pressure ◽  
Relaxation Times ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Pump Probe ◽  
Degenerate Four Wave Mixing

Degenerate four-wave mixing diagnostics of atmospheric pressure diamond deposition

1993 ◽  
Vol 2 (5-7) ◽  
pp. 661-666 ◽  
Author(s):  
T.G. Owano ◽  
C.H. Kruger ◽  
D.S. Green ◽  
S. Williams ◽  
R.N. Zare
Keyword(s):  
Atmospheric Pressure ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Diamond Deposition ◽  
Degenerate Four Wave Mixing

Excited state dynamics in phthalocyanines studied using degenerate four wave mixing with incoherent light

2002 ◽  
Vol 06 (03) ◽  
pp. 233-237 ◽  
Author(s):  
S. Venugopal Rao ◽  
D. Narayana Rao
Keyword(s):  
Excited State ◽  
Relaxation Times ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Phase Relaxation ◽  
Incoherent Light ◽  
Phase Conjugate ◽  
Excited State Dynamics ◽  
Degenerate Four Wave Mixing ◽  
Population Relaxation

We present our experimental results on the measurements of excited state dynamics in phthalocyanines ( Pc , CuPc , FePc , and ZnPc ) using degenerate four wave mixing with incoherent light (DFWM-IL). Three different timescales were observed, for all samples, in the phase conjugate signal recorded as a function of delay in probe beam in the standard backward geometry. The fastest component (< 170 fs) is associated to the phase relaxation in the S n states and the slowest components (∼3-5 ps and 35-55 ps) to the vibration and population relaxation times from the S1 state. The present results are compared with those obtained with shorter pulses and various techniques for similar molecules. The consequences of such short lifetimes are also discussed in view of the strong optical limiting properties of these molecules.

Ultrafast relaxation times of metalloporphyrins by time-resolved degenerate four-wave mixing with incoherent light

1997 ◽  
Vol 14 (10) ◽  
pp. 2710 ◽  
Author(s):  
D. Narayana Rao ◽  
S. Venugopal Rao ◽  
F. J. Aranda ◽  
D. V. G. L. N. Rao ◽  
M. Nakashima ◽  
...  
Keyword(s):  
Relaxation Times ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Incoherent Light ◽  
Time Resolved ◽  
Ultrafast Relaxation ◽  
Degenerate Four Wave Mixing

Femtosecond nonresonant degenerate four-wave mixing at atmospheric pressure and in a free jet

1999 ◽  
Vol 68 (4) ◽  
pp. 735-739 ◽  
Author(s):  
H.-M. Frey ◽  
P. Beaud ◽  
T. Gerber ◽  
B. Mischler ◽  
P.P. Radi ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Free Jet ◽  
Degenerate Four Wave Mixing

Enhanced Third Order Optical Nonlinear Response in Polythiophene Films—Polaron Contributions

1989 ◽  
Vol 173 ◽  
Author(s):  
Lina Yang ◽  
R. Dorsinville ◽  
R. Zamboni ◽  
C. Taliani ◽  
R. Tubino ◽  
...  
Keyword(s):  
Nonlinear Response ◽  
Four Wave Mixing ◽  
Nonlinear Susceptibility ◽  
Wave Mixing ◽  
Third Order ◽  
Pump Probe ◽  
Order Of Magnitude ◽  
Degenerate Four Wave Mixing ◽  
Thiophene Based Polymers ◽  
Third Order Nonlinear Susceptibility

ABSTRACTThe enhancement of the third order nonlinear susceptibility χ(3)) of an homologous series of polycondensed thiophene based polymers was observed about photoinduced polaronic bands by a novel “pump-probe” degenerate four wave mixing echnique. Enhancement of the degenerate four wave mixing signal for more than an order of magnitude was achieved with response time of less than 25 ps. The intrachain polarons contribution is proposed as the possible mechanism responsible for the observed enhancement.

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