Mutagenic Activity of High-Energy 532 nm Ultra-Short Laser Pulses

1997 ◽  
Vol 147 (4) ◽  
pp. 490 ◽  
Author(s):  
John Leavitt ◽  
Michael Fatone ◽  
Charles Hestdalen ◽  
John W. Obringer ◽  
Henry S. Tillinghast
Keyword(s):  
Mutagenic Activity ◽  
Laser Pulses ◽  
High Energy ◽  
Short Laser Pulses ◽  
532 Nm

scholarly journals Accelerating ions with high-energy short laser pulses from submicrometer thick targets

2016 ◽  
Vol 4 ◽  
Author(s):  
F. Wagner ◽  
C. Brabetz ◽  
O. Deppert ◽  
M. Roth ◽  
T. Stöhlker ◽  
...  
Keyword(s):  
Focal Plane ◽  
Short Pulse ◽  
Laser Pulses ◽  
High Energy ◽  
Ion Acceleration ◽  
Temporal Contrast ◽  
Short Pulse Laser ◽  
Target Intensity ◽  
Short Laser Pulses ◽  
And Control

Using the example of the PHELIX high-energy short pulse laser we discuss the technical preconditions to investigate ion acceleration with submicrometer thick targets. We show how the temporal contrast of this system was improved to prevent pre-ionization of such targets on the nanosecond timescale. Furthermore the influence of typical fluctuations or uncertainties of the on-target intensity on ion acceleration experiments is discussed. We report how these uncertainties were reduced by improving the assessment and control of the on-shot intensity and by optimizing the positioning of the target into the focal plane. Finally we report on experimental results showing maximum proton energies in excess of 85 MeV for ion acceleration via the target normal sheath acceleration mechanism using target thicknesses on the order of one micrometer.

Observation of a nearly isotropic, high-energy Coulomb explosion group in the fragmentation ofD2by short laser pulses

2002 ◽  
Vol 65 (2) ◽  
Author(s):  
A. Staudte ◽  
C. L. Cocke ◽  
M. H. Prior ◽  
A. Belkacem ◽  
C. Ray ◽  
...  
Keyword(s):  
Laser Pulses ◽  
High Energy ◽  
Coulomb Explosion ◽  
Short Laser Pulses

Transient Cooling of Ultrathin Epitaxial Bi(111)-Films on Si(111) Upon Femtosecond Laser Excitation Studied by Ultrafast Reflection High Energy Electron Diffraction

2009 ◽  
Vol 1172 ◽  
Author(s):  
Anja Hanisch-Blicharski ◽  
Boris Krenzer ◽  
Simone Möllenbeck ◽  
Manuel Ligges ◽  
Ping Zhou ◽  
...  
Keyword(s):  
Electron Diffraction ◽  
Temperature Rise ◽  
Laser Fluence ◽  
Initial Temperature ◽  
Laser Excitation ◽  
Laser Pulses ◽  
High Energy ◽  
Time Resolved ◽  
Thermal Boundary Conductance ◽  
Short Laser Pulses

AbstractWith time resolved ultrafast electron diffraction the cooling process across the interface between a thin film and the underlying substrate was studied after excitation with short laser pulses. From the exponential decay of the surface temperature evolution a thermal boundary conductance of 1430 W/(cm2K) is determined for a 9.7 nm thin Bi(111) film on Si(111). A linear dependence between laser fluence and initial temperature rise was measured for film-thicknesses between 2.5 nm and 34.5 nm. The ratio of initial temperature rise and laser fluence for different film-thicknesses is compared to a model taking multilayer optics into account. The data agree well with this model.

Ablation comparison with low and high energy densities for Cu and Al with ultra-short laser pulses

2005 ◽  
Vol 80 (7) ◽  
pp. 1589-1593 ◽  
Author(s):  
R. Le Harzic ◽  
D. Breitling ◽  
M. Weikert ◽  
S. Sommer ◽  
C. F�hl ◽  
...  
Keyword(s):  
Laser Pulses ◽  
High Energy ◽  
Short Laser Pulses

scholarly journals Femtosecond laser-induced damage threshold in snow micro-structured targets

2018 ◽  
Vol 6 ◽  
Author(s):  
O. Shavit ◽  
Y. Ferber ◽  
J. Papeer ◽  
E. Schleifer ◽  
M. Botton ◽  
...  
Keyword(s):  
Laser Energy ◽  
Local Density ◽  
Damage Threshold ◽  
Laser Pulses ◽  
High Energy ◽  
Hot Electron ◽  
Short Laser Pulses ◽  
Laser Induced Damage ◽  
Pulse Structure ◽  
Positively Charged

Enhanced acceleration of protons to high energy by relatively modest high power ultra-short laser pulses, interacting with snow micro-structured targets was recently proposed. A notably increased proton energy was attributed to a combination of several mechanisms such as localized enhancement of the laser field intensity near the tip of $1~\unicode[STIX]{x03BC}\text{m}$ size whisker and increase in the hot electron concentration near the tip. Moreover, the use of mass-limited target prevents undesirable spread of absorbed laser energy out of the interaction zone. With increasing laser intensity a Coulomb explosion of the positively charged whisker will occur. All these mechanisms are functions of the local density profile and strongly depend on the laser pre-pulse structure. To clarify the effect of the pre-pulse on the state of the snow micro-structured target at the time of interaction with the main pulse, we measured the optical damage threshold (ODT) of the snow targets. ODT of $0.4~\text{J}/\text{cm}^{2}$ was measured by irradiating snow micro-structured targets with 50 fs duration pulses of Ti:Sapphire laser.

scholarly journals Generation and confinement of high energy electrons generated by irradiation of ultra-intense short laser pulses onto cone targets

2008 ◽  
Vol 26 (2) ◽  
pp. 207-212 ◽  
Author(s):  
T. Nakamura ◽  
K. Mima ◽  
H. Sakagami ◽  
T. Johzaki ◽  
H. Nagatomo
Keyword(s):  
Electric Field ◽  
Cone Angle ◽  
Side Wall ◽  
Energy Coupling ◽  
Laser Pulses ◽  
High Energy ◽  
High Energy Electrons ◽  
Short Laser Pulses ◽  
Different Shapes ◽  
Two Parameters

AbstractInteractions of cone targets with different shapes with laser pulses are studied numerically. Two important parameters which characterize the laser-cone interaction in 2006 are introduced, which are cone angle and ratio of laser spot and cone tip. By changing these two parameters, energy coupling from laser to electrons is controlled. Some fraction of high energy electrons generated at side wall and cone tip are not freely propagating out from the target, but confined around the cone tip due to the disturbed electric field.

scholarly journals High-energy ion generation by short laser pulses

2004 ◽  
Vol 30 (6) ◽  
pp. 473-495 ◽  
Author(s):  
A. Maksimchuk ◽  
K. Flippo ◽  
H. Krause ◽  
G. Mourou ◽  
K. Nemoto ◽  
...  
Keyword(s):  
Laser Pulses ◽  
High Energy ◽  
Ion Generation ◽  
Short Laser Pulses
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