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

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.

Detection of Bloch oscillations in a semiconductor superlattice by time-resolved terahertz spectroscopy and degenerate four-wave mixing

1994 ◽  
Vol 37 (4-6) ◽  
pp. 1321-1326 ◽  
Author(s):  
Christian Waschke ◽  
Patrick Leisching ◽  
Peter Haring Bolivar ◽  
Ralf Schwedler ◽  
Frank Brüggemann ◽  
...  
Keyword(s):  
Terahertz Spectroscopy ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Bloch Oscillations ◽  
Time Resolved ◽  
Semiconductor Superlattice ◽  
Degenerate Four Wave Mixing

Nanosecond time‐resolved degenerate four‐wave mixing measurements of small Pd particles: Thermal phase grating analysis

1996 ◽  
Vol 104 (4) ◽  
pp. 1268-1271
Author(s):  
Yoshiro Tatsu ◽  
Soichiro Yamamura ◽  
Toru Sakaguchi ◽  
Masaru Miya ◽  
Toshio Fukumi ◽  
...  
Keyword(s):  
Four Wave Mixing ◽  
Wave Mixing ◽  
Phase Grating ◽  
Time Resolved ◽  
Thermal Phase ◽  
Degenerate Four Wave Mixing
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