Wavefront correction for near diffraction-limited focal spot on a 6×100 J/1-ns laser facility

2003 ◽  
Author(s):  
Julien Fuchs ◽  
Benoit F. Wattellier ◽  
Ji P. Zou ◽  
Jean-Christophe Chanteloup ◽  
H. Bandulet ◽  
...  
Keyword(s):  
Focal Spot ◽  
Wavefront Correction ◽  
Laser Facility

scholarly journals Interferometric investigations of influence of target irradiation on the parameters of laser-produced plasma jets

2007 ◽  
Vol 25 (3) ◽  
pp. 425-433 ◽  
Author(s):  
A. Kasperczuk ◽  
T. Pisarczyk ◽  
S. Borodziuk ◽  
J. Ullschmied ◽  
E. Krousky ◽  
...  
Keyword(s):  
Focal Spot ◽  
Laser Energy ◽  
Plasma Jet ◽  
Plasma Jets ◽  
Plasma Expansion ◽  
Third Harmonic ◽  
Fundamental Process ◽  
Laser Produced Plasma ◽  
Laser Facility ◽  
Planar Target

Our recent experimental results demonstrate that the formation of plasma jets is a fundamental process accompanying the laser produced plasma expansion, if a massive planar target with relatively high atomic number is irradiated by a defocused laser beam. In this paper some new results on the influence of target irradiation conditions on plasma jet parameters are presented. The experiment was carried out at the PALS iodine laser facility, with the third harmonic beam of the pulse duration of 250 ps (FWHM). The beam energies varied in the range of 13–160 J, the focal spot radii in the range of 35–600 µm. The planar massive targets used in the experiment were made of Cu, Ag and Ta. For measurements of the electron density evolution a three frame interferometric system was employed. The jets were observed in the whole range of the laser energy used. The initial velocities of the plasma jets produced in the reported experiment reached the value of up to 7·107 cm/s, the jets were up to 4 mm long including the jet pedestal and about 400 µm in diameter. Calculations of the efficiency of the plasma jet production show that it decreases with increasing the laser energy.

scholarly journals Numerical Simulations of Laser-Driven Cratering Experiments into Porous Graphite

2018 ◽  
Vol 183 ◽  
pp. 01060
Author(s):  
Bertrand Aubert ◽  
David Hebert ◽  
Jean-Luc Rullier ◽  
Jean-Marc Chevalier ◽  
Laurent Berthe ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Focal Spot ◽  
Surface Velocity ◽  
Power Laser ◽  
Graphite Target ◽  
Experimental Campaign ◽  
Porous Graphite ◽  
Thin Aluminum ◽  
Laser Facility ◽  
Focal Spot Diameter

We present the results of an experimental campaign conducted on the LULI2000 laser facility. Semi-infinite targets of a commercial grade of porous graphite were submitted to high-power laser irradiation inorder to generate craters. A 15 ns pulse duration was used along with a focal spot diameter of 900 µm to deliver energies up to 750 J. Numerical simulations of these shots have been performed following a specificmethodology which can be divided in three steps. Firstly, the mechanical loading induced by the laser iscalibrated by simulating the same shot on a thin aluminum target of which free surface velocity is measured byPDV and line-VISAR. Secondly, the same shot is performed on a thin graphite target to validate the materialmodel of graphite. Thirdly, the craterization shot on semi-infinite target is simulated. Numerical results arecompared to experimental measurements of craters obtained using an interferometric profilometer.

Focal spot measurement in ultra-intense ultra-short pulse laser facility

2005 ◽  
Author(s):  
Lanqin Liu ◽  
Hansheng Peng ◽  
Kainan Zhou ◽  
Xiaodong Wang ◽  
Xiao Wang ◽  
...  
Keyword(s):  
Pulse Laser ◽  
Focal Spot ◽  
Short Pulse ◽  
Short Pulse Laser ◽  
Laser Facility ◽  
Ultra Short Pulse ◽  
Ultra Short Pulse Laser

Far-field Focal Spot Measurement of 10kJ-level Laser Facility

2016 ◽  
Vol 45 (8) ◽  
pp. 812001
Author(s):  
王拯洲 WANG Zheng-zhou ◽  
夏彦文 XIA Yan-wen ◽  
李红光 LI Hong-guang ◽  
胡炳樑 HU Bing-liang ◽  
殷勤业 YIN Qin-ye ◽  
...  
Keyword(s):  
Focal Spot ◽  
Far Field ◽  
Level Laser ◽  
Laser Facility

Experimental study on wavefront correction in ultra-short laser facility

2010 ◽  
Vol 22 (7) ◽  
pp. 1433-1435
Author(s):  
谢娜 Xie Na ◽  
王晓东 Wang Xiaodong ◽  
胡东霞 Hu Dongxia ◽  
代万俊 Dai Wanjun ◽  
孙立 Sun Li ◽  
...  
Keyword(s):  
Experimental Study ◽  
Wavefront Correction ◽  
Laser Facility

scholarly journals Laser-induced cratering of a 3DCC material at mesoscale: Experiments and simulations

2018 ◽  
Vol 183 ◽  
pp. 01028
Author(s):  
Vincent Jaulin ◽  
David Hébert ◽  
Bertrand Aubert ◽  
Jean-Luc Rullier ◽  
Frédéric Malaise ◽  
...  
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Dynamic Behaviour ◽  
Focal Spot ◽  
Dynamic Pressure ◽  
Dynamic Strength ◽  
Mesoscopic Scale ◽  
Spot Diameter ◽  
Laser Facility ◽  
Focal Spot Diameter

This study concerns the damaging of a 3-Dimension Carbon/Carbon (3DCC) composite material under dynamic loading. Experiments were performed with a laser facility delivering energies between 13 and 40 J with 100 nanoseconds pulse duration. The focal spot diameter was 250 μm, leading to dynamic pressure up to 10 GPa. The focal spot being smaller than the size of the composite components, it allows us to study the dynamic behaviour of the material at mesoscopic scale. The dynamic process of this cratering is then investigated via 3D numerical simulations, and a Johnson-Holmquist model is proposed. It appears that comparison of simulations with experimental results is useful to identify the dynamic strength of individual components of composite materials.

scholarly journals The PHEBUS experimental facility operating at 250 ps and 0·53 μm

1988 ◽  
Vol 6 (1) ◽  
pp. 93-103 ◽  
Author(s):  
G. Thiell ◽  
A. Adolf ◽  
M. Andre ◽  
N. Fleurot ◽  
D. Friart ◽  
...  
Keyword(s):  
Large Scale ◽  
Focal Spot ◽  
Laser Light ◽  
Laser System ◽  
Plasma Expansion ◽  
One Dimensional ◽  
Spatial Intensity Distribution ◽  
Flux Limiter ◽  
Laser Facility ◽  
Inverse Bremsstrahlung Absorption

The experiments reported in this paper demonstrate that the PHEBUS laser facility is now currently being operated with high performances (4 TW with 250 ps pulses at 0·527 μm wavelength).The output energy of the 2-beam PHEBUS laser system can be focused either in a small focal spot (80% of the incident energy is in a 220 μm diameter focal spot) for high intensity experiments (≥5 × 1015 W cm−2) or in very large spots (a few mm in diameter) at moderate intensities (1013 − 2·5 × 1014 W cm−2), for large scale experiments. It is shown that the spatial intensity distribution in the target plane is primarily due to intensity independent aberrations and to diffraction. Laser light absorption in plane aluminum and gold targets are interpreted in terms of inverse bremsstrahlung absorption that may account for 70 to 90% of absorbed energy. Finally, the plasma expansion is shown to be very planar and comparison with one-dimensional Lagrangian simulations gives flux limiter values of 0·03 and 0·02 respectively for Al and Au targets.

Adaptive system for wavefront correction of the PEARL laser facility

2020 ◽  
Vol 50 (12) ◽  
pp. 1115-1122
Author(s):  
A.A. Soloviev ◽  
A.V. Kotov ◽  
S.E. Perevalov ◽  
M.V. Esyunin ◽  
M.V. Starodubtsev ◽  
...  
Keyword(s):  
Adaptive System ◽  
Wavefront Correction ◽  
Laser Facility

scholarly journals Plastic plasma as a compressor of aluminum plasma at the PALS experiment

2011 ◽  
Vol 30 (1) ◽  
pp. 1-7 ◽  
Author(s):  
A. Kasperczuk ◽  
T. Pisarczyk ◽  
T. Chodukowski ◽  
Z. Kalinowska ◽  
S.Yu. Gus'kov ◽  
...  
Keyword(s):  
Focal Spot ◽  
Laser System ◽  
Target Material ◽  
Plasma Pressure ◽  
Plasma Stream ◽  
Harmonic Frequency ◽  
Third Harmonic ◽  
X Ray ◽  
Laser Facility ◽  
Aluminum Plasma

AbstractIn our earlier papers, we demonstrated that plasma pressure decreases with the growing atomic number of the target material. That experimentally confirmed fact brought about a question whether it would be possible to collimate the Al plasma outflow by using plastic plasma as a compressor. To prove that idea we used in our next experiments a plastic target with an Al cylindrical insert of 400 µm in diameter. The measurements were carried out at the Prague Asterix Laser System iodine laser facility. The laser provided a 250 ps (full width at half maximum (FWHM)) pulse with energy of 130 J at the third harmonic frequency (λ3 = 0.438 µm). The focal spot diameters (ΦL) 800, 1000, and 1200 µm ensured predominance of the plastic plasma amount high enough for the effective Al plasma compression. To study the Al plasma stream propagation and its interaction with plastic plasma a three-frame interferometric system and an X-ray camera were used. The experiment provided a proof that creation of the collimated Al plasma jet by action of outer plastic plasma is feasible. In order to discuss of the experimental results a thorough theoretical analysis was carried out.

Wavefront Correction and Customization of Focal Spot of 100 TW Ti:Sapphire Laser System

2007 ◽  
Vol 46 (12) ◽  
pp. 7724-7730 ◽  
Author(s):  
Tae Moon Jeong ◽  
Il Woo Choi ◽  
Nasr Hafz ◽  
Jae Hee Sung ◽  
Seong Ku Lee ◽  
...  
Keyword(s):  
Focal Spot ◽  
Laser System ◽  
Wavefront Correction ◽  
Ti:Sapphire Laser
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