The primary stages of the charge carrier photogeneration in C60 films studied by the 100-fs laser pulse pump-probe method

2001 ◽  
Vol 93 (4) ◽  
pp. 706-716 ◽  
Author(s):  
S. V. Chekalin ◽  
A. P. Yartsev ◽  
V. Sundström
Keyword(s):  
Laser Pulse ◽  
Charge Carrier ◽  
Probe Method ◽  
Pump Probe ◽  
Fs Laser ◽  
Pulse Pump ◽  
C60 Films

A two-pulse, pump-probe method for short-range, remote standoff detection of chemical warfare agents

2011 ◽  
Author(s):  
Scott E. Bisson ◽  
Jeffrey M. Headrick ◽  
Thomas A. Reichardt ◽  
Roger L. Farrow ◽  
Thomas J. Kulp
Keyword(s):  
Short Range ◽  
Chemical Warfare Agents ◽  
Chemical Warfare ◽  
Probe Method ◽  
Pump Probe ◽  
Standoff Detection ◽  
Warfare Agents ◽  
Pulse Pump

Re-examining Electron-Fermi Relaxation in Gold Films With a Nonlinear Thermoreflectance Model

2011 ◽  
Vol 133 (4) ◽  
Author(s):  
Patrick E. Hopkins ◽  
Leslie M. Phinney ◽  
Justin R. Serrano
Keyword(s):  
Thin Film ◽  
Relaxation Time ◽  
Laser Pulse ◽  
Thermophysical Property ◽  
Electron Emission ◽  
Electron System ◽  
Gold Films ◽  
Pump Probe ◽  
Fs Laser ◽  
20 Nm

In this work, we examine Fermi relaxation in 20 nm Au films with pump-probe themoreflectance using a thin film, intraband thermoreflectance model. Our results indicate that the Fermi relaxation of a perturbed electron system occurs approximately 1.10±0.05 ps after absorption of a 785 nm, 185 fs laser pulse. This is in agreement with reported values from electron emission experiments but is higher than the Fermi relaxation time determined from previous thermoreflectance measurements. This discrepancy arises due to thermoreflectance modeling and elucidates the importance of the use of a proper thermoreflectance model for thermophysical property determination in pump-probe experiments.

Pump-probe method for measurement of thickness of molten layer produced by ultrashort laser pulse

2010 ◽  
Author(s):  
N. A. Inogamov ◽  
V. V. Zhakhovsky ◽  
S. I. Ashitkov ◽  
M. B. Agranat ◽  
P. S. Komarov ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Ultrashort Laser Pulse ◽  
Probe Method ◽  
Molten Layer ◽  
Pump Probe ◽  
Ultrashort Laser ◽  
Measurement Of Thickness

Exciton study in PbI2 microcrystallites by pump-probe method

1994 ◽  
Vol 89 (1) ◽  
pp. 17-21 ◽  
Author(s):  
T. Goto ◽  
H. Tanaka
Keyword(s):  
Probe Method ◽  
Pump Probe

CO and OH Imaging in Flames Using a Single Broadband Femtosecond Laser Pulse

2020 ◽  
Author(s):  
Pradeep Parajuli ◽  
Ayush Jain ◽  
Waruna D. Kulatilaka
Keyword(s):  
Laser Pulse ◽  
Reaction Zone ◽  
Turbulent Flame ◽  
Flame Structure ◽  
Chemical Species ◽  
Oxidation Reactions ◽  
Simultaneous Excitation ◽  
Spatiotemporal Information ◽  
Flame Burner ◽  
Fs Laser

Abstract Carbon monoxide (CO) and hydroxyl (OH) are the two key intermediate species formed during chemical reactions inside gas turbine combustors. Spatiotemporal information and a detailed understanding of CO formation in the reaction zone are important during the combustion processes as a major part of the heat release is obtained from the oxidation of CO to CO2. Turbulent flame structures and reaction zone in different flame conditions can also be visualized through the spatial distribution profiles of OH. In the current study, both these species are excited simultaneously using a single ultrashort, broad spectral bandwidth of approximately 100-femtosecond (fs) duration laser pulse at λ = 283.8 nm. Subsequent fluorescence signals are separated through spectral filters of appropriate bandwidth and imaged using two cameras. This present study was performed in a McKenna flat-flame burner with ethylene/air as a pilot flame and non-premixed turbulent ethylene jet at the center. The partial spectral overlap of CO–X (4,0) and OH A–X (1,0) transitions are utilized for simultaneous excitation, thereby characterize the overall flame structure (via OH) and regions of oxidation reactions (via CO) in a range of flame conditions. Besides, CO and OH profiles follow the trends obtained from model predictions for a range of equivalence ratios in ethylene/air flames stabilized over the Hencken calibration burner. These results are used for obtaining quantitative calibrations of CO and OH signals. Overall, the present study extends the applicability of a single, broadband fs laser pulse for simultaneous imaging of multiple chemical species in flame.

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