scholarly journals Interaction of annular-focused laser beams with solid targets

2015 ◽  
Vol 33 (3) ◽  
pp. 541-550 ◽  
Author(s):  
N.E. Andreev ◽  
M.E. Povarnitsyn ◽  
M.E. Veysman ◽  
A.YA. Faenov ◽  
P.R. Levashov ◽  
...  
Keyword(s):  
Laser Energy ◽  
Laser Pulses ◽  
Heavy Ion ◽  
High Energy ◽  
Weakly Coupled ◽  
Wide Range ◽  
Energy Laser ◽  
High Energy Laser ◽  
Hydrodynamic Code ◽  
Two Temperature

AbstractThe two-temperature, 2D hydrodynamic code Hydro–ELectro–IOnization–2–Dimensional (HELIO2D), which takes into account self-consistently the laser energy absorption in a target, ionization, heating, and expansion of the created plasma is elaborated. The wide-range two-temperature equation of state is developed and used to model the metal target dynamics from room temperature to the conditions of weakly coupled plasma. The simulation results are compared and demonstrated a good agreement with experimental data on the Mg target being heated by laser pulses of the nanosecond high-energy laser for heavy ion experiments (NHELIX) at Gesellschaft fur Schwerionenforschung. The importance of using realistic models of matter properties is demonstrated.

Optical fibre beam delivery of high-energy laser pulses: beam quality preservation and fibre end-preparation

2000 ◽  
Vol 34 (4-6) ◽  
pp. 273-288 ◽  
Author(s):  
A. Kuhn ◽  
I.J. Blewett ◽  
D.P. Hand ◽  
P. French ◽  
M. Richmond ◽  
...  
Keyword(s):  
Optical Fibre ◽  
Beam Quality ◽  
Laser Pulses ◽  
High Energy ◽  
Energy Laser ◽  
High Energy Laser ◽  
Beam Delivery

Calibration methods and calibration systems of water-absorption-type high energy laser energy meters

2014 ◽  
Vol 26 (12) ◽  
pp. 120201 ◽  
Author(s):  
魏继锋 Wei Jifeng ◽  
张卫 Zhang Wei ◽  
何均章 He Junzhang ◽  
周山 Zhou Shan ◽  
彭勇 Peng Yong ◽  
...  
Keyword(s):  
Water Absorption ◽  
Laser Energy ◽  
High Energy ◽  
Calibration Methods ◽  
Energy Laser ◽  
High Energy Laser

scholarly journals Evaluation of the Weighted Mean X-ray Energy for an Imaging System Via Propagation-Based Phase-Contrast Imaging

2020 ◽  
Vol 6 (7) ◽  
pp. 63
Author(s):  
Maria Seifert ◽  
Mareike Weule ◽  
Silvia Cipiccia ◽  
Silja Flenner ◽  
Johannes Hagemann ◽  
...  
Keyword(s):  
Phase Contrast ◽  
Heavy Ion ◽  
High Energy ◽  
Phase Contrast Imaging ◽  
Single Shot ◽  
Contrast Imaging ◽  
Weighted Mean ◽  
X Ray ◽  
Energy Laser ◽  
High Energy Laser

For imaging events of extremely short duration, like shock waves or explosions, it is necessary to be able to image the object with a single-shot exposure. A suitable setup is given by a laser-induced X-ray source such as the one that can be found at GSI (Helmholtzzentrum für Schwerionenforschung GmbH) in Darmstadt (Society for Heavy Ion Research), Germany. There, it is possible to direct a pulse from the high-energy laser Petawatt High Energy Laser for Heavy Ion eXperiments (PHELIX) on a tungsten wire to generate a picosecond polychromatic X-ray pulse, called backlighter. For grating-based single-shot phase-contrast imaging of shock waves or exploding wires, it is important to know the weighted mean energy of the X-ray spectrum for choosing a suitable setup. In propagation-based phase-contrast imaging the knowledge of the weighted mean energy is necessary to be able to reconstruct quantitative phase images of unknown objects. Hence, we developed a method to evaluate the weighted mean energy of the X-ray backlighter spectrum using propagation-based phase-contrast images. In a first step wave-field simulations are performed to verify the results. Furthermore, our evaluation is cross-checked with monochromatic synchrotron measurements with known energy at Diamond Light Source (DLS, Didcot, UK) for proof of concepts.

Experimental Investigation on Underwater Opto-Acoustic Communication

2011 ◽  
Vol 143-144 ◽  
pp. 653-657
Author(s):  
Tao Liu ◽  
Jian Gan Wang ◽  
Si Guang Zong
Keyword(s):  
Acoustic Communication ◽  
Acoustic Pressure ◽  
Optical Breakdown ◽  
Laser Pulses ◽  
Acoustic Signals ◽  
High Energy ◽  
Acoustic Energy ◽  
Underwater Sound ◽  
Energy Laser ◽  
High Energy Laser

The underwater opto-acoustic communication system for directional acoustic communication between an in-air platform and a submerged platform operating is important. The paper presents a new method to solve this problem with opto-acoustic technology, which combines high-energy laser, the opto-acoustic transmitter that optical energy is converted to acoustic energy at the water surface. The laser-based transmitter provides a versatile method for generating underwater sound. The acoustic pressure is linearly proportional to the laser power. The paper designed an experimental measurement system for the opto-acoustic communication. It made experiments for study on the waveform and spectrum characteristics of opto-acoustic signals. The paper also discuss the acoustic wave after optical breakdown in water with Nd:YAG laser pulses. The opto-acoustic signals can controll by adjusting the laser's parameters. The conclusion is that the opto-acoustic communication has some technical advantages. This system presents a change in the way communicational from the air.

Transparent laser damage resistant nematic liquid crystal cell “LCNP3”

2014 ◽  
Vol 22 (3) ◽  
Author(s):  
Z. Raszewski ◽  
W. Piecek ◽  
L. Jaroszewicz ◽  
R. Dąbrowski ◽  
E. Nowinowski-Kruszelnicki ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Laser Pulses ◽  
High Energy ◽  
Optical Path ◽  
Liquid Crystal Cell ◽  
Crystal Cell ◽  
Energy Laser ◽  
High Energy Laser ◽  
Twisted Nematic Liquid Crystal

AbstractThere exists the problem in diagnostics of dense plasma (so-called Thomson diagnostics). For this purpose the plasma is illuminated by series of high energy laser pulses. The energy of each separate pulse is as large as 3 J, so it is impossible to generate a burst of such pulses by a single laser. In this situation, the pulses are generated by several independent lasers operating sequentially, and these pulses are to be directed along the same optical path. To form an optical path with λ = 1.064 μm and absolute value of the laser pulse energy of 3 J, a special refractive index matched twisted Nematic Liquid Crystal Cell of type LCNP3, with switching on time τON smaller than 3 μs was applied.

Compression of high-energy laser pulses below 5 fs

1997 ◽  
Vol 22 (8) ◽  
pp. 522 ◽  
Author(s):  
M. Nisoli ◽  
S. De Silvestri ◽  
O. Svelto ◽  
R. Szipöcs ◽  
K. Ferencz ◽  
...  
Keyword(s):  
Laser Pulses ◽  
High Energy ◽  
Energy Laser ◽  
High Energy Laser

Simulation on the Effects of Misaligned Coupling on the Output Intensity Distribution in Water-Jet Guided Laser

2011 ◽  
Vol 211-212 ◽  
pp. 400-405 ◽  
Author(s):  
Chun Qi Li ◽  
Li Jun Yan ◽  
Yang Wang ◽  
Jing Tang
Keyword(s):  
Intensity Distribution ◽  
Laser Energy ◽  
Coupling Efficiency ◽  
High Energy ◽  
Water Jet ◽  
Energy Output ◽  
Output Intensity ◽  
Material Processing Technology ◽  
Energy Laser ◽  
High Energy Laser

Water-jet guided laser machining is a kind of material processing technology using water optical waveguide which is formed by coupling a high energy laser beam into variable-length water jet. In order to design the coupling unit and form the effective energy-jet, the research on the distribution of output intensity is beneficial to understand the structure of the coupling unit and improve the coupling efficiency of laser energy. This paper lists the different coupling misalignments in the coupling unit when laser couplings into water-jet. In this paper, the distribution of energy output intensity in water-jet guided laser is simulated with the ray trace theory under several different types of coupling misalignments with ZEMAX software, the results show that misaligned coupling provide various morphology of energy output intensity distribution: center peak morphology, ring peak morphology, and uniform peak morphology, which provides a method to optimize the energy output intensity distribution of water-jet guided laser.

Mechanical effects induced by shock waves generated by high energy laser pulses

1991 ◽  
Vol 1 (9) ◽  
pp. 1467-1480 ◽  
Author(s):  
J. Fournier ◽  
P. Ballard ◽  
P. Merrien ◽  
J. Barralis ◽  
L. Castex ◽  
...  
Keyword(s):  
Shock Waves ◽  
Laser Pulses ◽  
High Energy ◽  
Mechanical Effects ◽  
Energy Laser ◽  
High Energy Laser
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