Pump-probe measurement of silicon L2,3 absorption edge change induced by femtosecond laser pulses

1999 ◽  
Author(s):  
Hidetoshi Nakano ◽  
Yoshinori Goto ◽  
Pelxiang Lu ◽  
Tadashi Nishikawa ◽  
Naoshl Uesugi
Keyword(s):  
Femtosecond Laser ◽  
Absorption Edge ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Probe Measurement ◽  
Pump Probe

scholarly journals Understanding the Seeding Pulse-Induced Optical Amplification in N 2 + Pumped by 800 NM Femtosecond Laser Pulses

Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 99
Author(s):  
Zhengquan Fan ◽  
Xiang Zhang ◽  
Qi Lu ◽  
Yu Luo ◽  
Qingqing Liang ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Optical Gain ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Time Resolved ◽  
Optical Amplification ◽  
Pump Probe ◽  
Amplification Process ◽  
Energy Amplification

Nitrogen ions pumped by intense femtosecond laser pulses present an optical gain at 391.4 nm, evident by energy amplification of an injected resonant seeding pulse. We report a time-resolved measurement of the amplification process with seeding pulses having varying intensities. It is found that the amplification factor depends on the intensity of the seeding pulse and the effective temporal window for the optical gain becomes longer by applying more intense seeding pulses. These two features are in sharp contrast with classic pump-probe experiments, pinpointing the crucial role of macroscopic coherence and its dynamics during the lasing process. We further measure the temporal profile of the amplified emission for seeding pulse injected at different time delays. A complicated temporal behavior is observed, which highlights the nature of the superfluorescence.

Laser Ion Kinetics: Dynamics of Intramolecular Reactions in Substituted Benzalacetones

2000 ◽  
Vol 6 (2) ◽  
pp. 143-152 ◽  
Author(s):  
R. Heinicke ◽  
C. Grun ◽  
J. Grotemeyer
Keyword(s):  
Femtosecond Laser ◽  
Mass Spectrometer ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Photon Absorption ◽  
Single Shot ◽  
Pump Probe ◽  
Intramolecular Reactions ◽  
The Stability ◽  
Fragmentation Processes

Measurements of a single shot femtosecond laser pump-probe technique on substituted benzalacetones are reported. The technique is based on counter propagating femtosecond laser pulses in a supersonic beam of low density of sample molecules and simultaneous probe detection by ion or fragment ion formation through a reflectron time-of-flight mass spectrometer. It will be shown that the range of the pump-probe delays covers the time span between 100 fs and 10 ps depending on the pulse width of the laser used and the stability of the voltages of the mass spectrometer. The application of this technique to medium-sized organic molecules reveals some insight into the electron transfer process during ionisation through a 1 + 1 multi-photon absorption procedure. Furthermore it is demonstrated that this technique is also applicable to the investigation of ultra-fast isomerisation and fragmentation processes.

Generation and Detection of Coherent Acoustic Pulses by Femtosecond Laser Pulses

2009 ◽  
Author(s):  
Chunlei Guo
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
Dielectric Materials ◽  
Acoustic Oscillation ◽  
Femtosecond Laser Pulses ◽  
Acoustic Properties ◽  
Optical Pump ◽  
Pump Probe ◽  
Probe Technique ◽  
Dielectric System

In this paper, we systematically study the generation and propagation of coherent acoustic pulses in a metal-dielectric system using a two-color femtosecond pump-probe technique at different probe angles. A long-lived acoustic oscillation is observed in a borosilicate glass coated with gold and shows different attenuation and amplitude at different probe wavelength. Our study suggests that the two-color optical pump-probe technique can be utilized as a noninvasive tool to study acoustic properties of dielectric materials.

Photodissociation/photoionization processes of chlorobromomethane induced by femtosecond laser pulses with pump-probe scheme

2008 ◽  
Vol 53 (5) ◽  
pp. 681-686 ◽  
Author(s):  
Feng Zhang ◽  
ZhengRong Wei ◽  
ZhenZhou Cao ◽  
ChangHua Zhang ◽  
Bing Zhang
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Pump Probe

ANALYSIS OF MAGNETIC PROPERTY MEASUREMENTS IN ULTRAFAST MAGNETIZATION DYNAMICS

2010 ◽  
Vol 24 (21) ◽  
pp. 2215-2224
Author(s):  
X. R. WANG
Keyword(s):  
Magnetic Properties ◽  
Magnetic Property ◽  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Magnetization Dynamics ◽  
Pump Probe ◽  
Transient States ◽  
Ultrafast Magnetization

Recent efforts in measuring magnetic properties of ferromagnets in their transient states created by the illumination of intensive femtosecond laser pulses are critically re-analyzed. It is concluded that, although various pump-probe architectures can provide certain information about the magnetic properties of disturbed ferromagnets in their transient states, these schemes measured neither coercivity nor remanence defined in the conventional sense. One of the popular experimental schemes cannot even be used to define the working definitions of coercivity and remanence becuase they depend on the details of pumping pulses.

Inorganic-organic Hybrid Materials for Real 3-D Sub-νm Lithography

2003 ◽  
Vol 780 ◽  
Author(s):  
R. Houbertz ◽  
J. Schulz ◽  
L. Fröhlich ◽  
G. Domann ◽  
M. Popall ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Sol Gel ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Hybrid Polymer ◽  
Organic Hybrid ◽  
Two Photon ◽  
Applied Technology ◽  
Scale Structures ◽  
Sol Gel Synthesis

AbstractReal 3-D sub-νm lithography was performed with two-photon polymerization (2PP) using inorganic-organic hybrid polymer (ORMOCER®) resins. The hybrid polymers were synthesized by hydrolysis/polycondensation reactions (modified sol-gel synthesis) which allows one to tailor their material properties towards the respective applications, i.e., dielectrics, optics or passivation. Due to their photosensitive organic functionalities, ORMOCER®s can be patterned by conventional photo-lithography as well as by femtosecond laser pulses at 780 nm. This results in polymerized (solid) structures where the non-polymerized parts can be removed by conventional developers.ORMOCER® structures as small as 200 nm or even below were generated by 2PP of the resins using femtosecond laser pulses. It is demonstrated that ORMOCER®s have the potential to be used in components or devices built up by nm-scale structures such as, e.g., photonic crystals. Aspects of the materials in conjunction to the applied technology are discussed.

Ablation of metals with femtosecond laser pulses

2001 ◽  
Author(s):  
K. H. Leong ◽  
T. Y. Plew ◽  
R. L. Maynard ◽  
A. A. Said ◽  
L. A. Walker
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses
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