Excited-state structure and dephasing of point defects in widegap semiconductors: ultrafast four-wave mixing spectroscopy of N-V centers in diamond

1994 ◽  
Author(s):  
Stephen C. Rand ◽  
A. Lenef ◽  
Steve W. Brown
Keyword(s):  
Excited State ◽  
Point Defects ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
State Structure

scholarly journals Excited-state Structure and Dynamics of Nitric Oxide probed by Resonant Four-wave Mixing Techniques

1996 ◽  
Vol 49 (2) ◽  
pp. 445 ◽  
Author(s):  
EF McCormack ◽  
ST Pratt ◽  
PM Dehmer ◽  
JL Dehmer
Keyword(s):  
Nitric Oxide ◽  
Excited State ◽  
Double Resonance ◽  
Four Wave Mixing ◽  
Quantum Beats ◽  
Wave Mixing ◽  
State Structure ◽  
Structure And Dynamics ◽  
Resonance Transitions ◽  
Mixing Techniques

We review the results from two experiments that used resonant four-wave mixing (RFWM) techniques to investigate double-resonance transitions in NO. In the first experiment, laserinduced grating decay curves that reveal quantum beats due to the hyperfine structure of the A 2Σ, υ' = 0 state were observed and interpreted. In the second, multistate interactions between the L 2II1/ 2,3/2, υ = 8 and Q 2II1/ 2,3/2, υ = 0 states were investigated, and new assignments were made. The results highlight the potential of RFWM techniques for probing excited-state physics.

Experimental setups for FEL-based four-wave mixing experiments at FERMI

2016 ◽  
Vol 23 (1) ◽  
pp. 132-140 ◽  
Author(s):  
Filippo Bencivenga ◽  
Marco Zangrando ◽  
Cristian Svetina ◽  
Alessandro Abrami ◽  
Andrea Battistoni ◽  
...  
Keyword(s):  
Excited State ◽  
Inelastic Scattering ◽  
Free Electron ◽  
Free Electron Laser ◽  
Scientific Community ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Experimental Facilities ◽  
Near Future ◽  
Experimental Strategies

The recent advent of free-electron laser (FEL) sources is driving the scientific community to extend table-top laser research to shorter wavelengths adding elemental selectivity and chemical state specificity. Both a compact setup (mini-TIMER) and a separate instrument (EIS-TIMER) dedicated to four-wave-mixing (FWM) experiments has been designed and constructed, to be operated as a branch of the Elastic and Inelastic Scattering beamline: EIS. The FWM experiments that are planned at EIS-TIMER are based on the transient grating approach, where two crossed FEL pulses create a controlled modulation of the sample excitations while a third time-delayed pulse is used to monitor the dynamics of the excited state. This manuscript describes such experimental facilities, showing the preliminary results of the commissioning of the EIS-TIMER beamline, and discusses original experimental strategies being developed to study the dynamics of matter at the fs–nm time–length scales. In the near future such experimental tools will allow more sophisticated FEL-based FWM applications, that also include the use of multiple and multi-color FEL pulses.

Degenerate four-wave mixing based on excited-state absorption in azo-dye-doped polymer films

1996 ◽  
Vol 62 (3) ◽  
pp. 299-302 ◽  
Author(s):  
H. Fei ◽  
Y. Yang ◽  
Z. Wei ◽  
L. Han ◽  
Y. Che ◽  
...  
Keyword(s):  
Excited State ◽  
Polymer Films ◽  
Azo Dye ◽  
Excited State Absorption ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Degenerate Four Wave Mixing ◽  
Doped Polymer

Ground- and Excited-State Vibrational Coherence Dynamics in Bacteriorhodopsin Probed With Degenerate Four-Wave-Mixing Experiments

ChemPhysChem ◽  
2011 ◽  
Vol 12 (10) ◽  
pp. 1851-1859 ◽  
Author(s):  
Jan Philip Kraack ◽  
Tiago Buckup ◽  
Norbert Hampp ◽  
Marcus Motzkus
Keyword(s):  
Excited State ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Vibrational Coherence ◽  
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.

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