scholarly journals Pedestal cleaning for high laser pulse contrast ratio with a 100 TW class laser system

2011 ◽  
Vol 19 (9) ◽  
pp. 8486 ◽  
Author(s):  
S. Fourmaux ◽  
S. Payeur ◽  
S. Buffechoux ◽  
P. Lassonde ◽  
C. St-Pierre ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Laser System ◽  
Contrast Ratio ◽  
High Laser ◽  
Pulse Contrast

scholarly journals Contrast ratio enhancement by spectral matching of a seed laser pulse and ASE in a Ti:sapphire laser system

2017 ◽  
Vol 25 (13) ◽  
pp. 14158 ◽  
Author(s):  
Minseok Kim ◽  
Jinju Kim ◽  
Vanessa Ling Jen Phung ◽  
Hyyong Suk
Keyword(s):  
Laser Pulse ◽  
Laser System ◽  
Contrast Ratio ◽  
Seed Laser ◽  
Spectral Matching ◽  
Ti:Sapphire Laser

scholarly journals Laser Pulse Contrast Ratio Cleaning in 100 TW Scale Ti: Sapphire Laser Systems

10.5772/24038 ◽  
2011 ◽  
Author(s):  
Sylvain Fourmaux ◽  
Stephane Payeur ◽  
Philippe Lassonde ◽  
Jean-Claude Kieffer ◽  
Francois Marti
Keyword(s):  
Laser Pulse ◽  
Contrast Ratio ◽  
Sapphire Laser ◽  
Laser Systems ◽  
Pulse Contrast

scholarly journals Equation-of-state studies using a 10-Hz Nd:YAG laser oscillator

2003 ◽  
Vol 21 (4) ◽  
pp. 615-626 ◽  
Author(s):  
M. SHUKLA ◽  
A. UPADHYAY ◽  
V.K. SENECHA ◽  
P. KHARE ◽  
S. BANDYAOPADHYAY ◽  
...  
Keyword(s):  
Equation Of State ◽  
Laser Pulse ◽  
Beam Quality ◽  
Impedance Matching ◽  
Laser System ◽  
Control Unit ◽  
Aluminum Foil ◽  
Single Laser Pulse ◽  
High Contrast ◽  
Single Laser

A commercial mode locked cavity dumped Nd:YAG dye laser operating at 10 Hz repetition rate is modified to produce a high contrast (>5000:1) single laser pulse while maintaining the energy stability and high beam quality. A trigger generator biases the cavity dumping photodiode, which is triggered externally by a pulse from the microprocessor-based control unit controlling a ∼2 J/200 ps laser chain. In the laser chain, the high contrast (>5000:1) is achieved by an external pulse selector based on single Pockel's cell to select a single laser pulse of high contrast, which is a prerequisite for experimental study of the equation of state. Laser-induced shock velocity measurement in thin aluminum, gold on aluminum, and copper on aluminum foil targets using this modified laser system are also presented. The equation of state of Al, Au, and Cu obtained using an impedance matching technique are in agreement with the reported results of SESAME and simulation results.

High-contrast, high-intensity laser pulse generation using a nonlinear preamplifier in a Ti:sapphire laser system

2008 ◽  
Vol 33 (7) ◽  
pp. 645 ◽  
Author(s):  
Hiromitsu Kiriyama ◽  
Michiaki Mori ◽  
Yoshiki Nakai ◽  
Takuya Shimomura ◽  
Manabu Tanoue ◽  
...  
Keyword(s):  
Laser Pulse ◽  
High Intensity ◽  
Laser System ◽  
Pulse Generation ◽  
High Contrast ◽  
Ti:Sapphire Laser ◽  
High Intensity Laser ◽  
Intensity Laser

Modeling the Femtosecond Laser Pulse-Train Ablation of Dielectrics

2005 ◽  
Author(s):  
L. Jiang ◽  
H. L. Tsai
Keyword(s):  
Optical Properties ◽  
Laser Pulse ◽  
Femtosecond Laser ◽  
Pulse Train ◽  
Femtosecond Pulse ◽  
Laser System ◽  
Ablation Depth ◽  
Plasma Model ◽  
Depth Zone

Recently, a new laser micromachining technique using multiple femtosecond pulses with a picosecond-to-nanosecond separation as a train group has demonstrated the ability to increase the ablation quality of dielectrics and semiconductors. However, the mechanisms involved in the technique are not fully understood. This study employs the plasma model recently developed by the authors to analyze the femtosecond pulse-train ablation of dielectrics. It is found that the transient significantly varying optical properties are the important reasons that lead to the advantages of the pulse-train technique. It has demonstrated that there exits a constant ablation-depth zone with respect to fluence, which has also been observed experimentally. By using the pulse-train technology, it is possible to obtain repeatable nanostructures, even when the laser system is subject to some fluctuations in fluences.

scholarly journals Non-adiabatic cluster expansion after ultrashort laser interaction

2008 ◽  
Vol 26 (1) ◽  
pp. 69-82 ◽  
Author(s):  
A.Ya. Faenov ◽  
A.I. Magunov ◽  
T.A. Pikuz ◽  
I.Yu. Skobelev ◽  
D. Giulietti ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Cluster Expansion ◽  
Plasma Electron ◽  
Laser Interaction ◽  
Homogeneous Plasma ◽  
X Ray ◽  
Rydberg Transitions ◽  
Ultrashort Laser ◽  
Pulse Contrast ◽  
Plasma Electron Density

AbstractWe used X-ray spectroscopy as a diagnostic tool for investigating the properties of laser-cluster interactions at the stage in which non-adiabatic cluster expansion takes place and a quasi-homogeneous plasma is produced. The experiment was carried out with a 10 TW, 65 fs Ti:Sa laser focused on CO2 cluster jets. The effect of different laser-pulse contrast ratios and cluster concentrations was investigated. The X-ray emission associated to the Rydberg transitions allowed us to retrieve, through the density and temperature of the emitting plasma, the time after the beginning of the interaction at which the emission occurred. The comparison of this value with the estimated time for the “homogeneous” plasma formation shows that the degree of adiabaticity depends on both the cluster concentration and the pulse contrast. Interferometric measurements support the X-ray data concerning the plasma electron density.

High contrast ratio Nd:glass front-end laser system with a femtosecond seed source

2007 ◽  
Author(s):  
V. I. Chernomyrdin ◽  
S. A. Chizhov ◽  
A. V. Kilpio ◽  
R. L. Sabirov ◽  
E. G. Sall ◽  
...  
Keyword(s):  
Laser System ◽  
Contrast Ratio ◽  
Seed Source ◽  
High Contrast ◽  
Front End

Spectrum of shock waves produced by an optical discharge at a high laser-pulse repetition rate

2002 ◽  
Vol 32 (4) ◽  
pp. 329-334 ◽  
Author(s):  
V N Tishchenko ◽  
Gennadii N Grachev ◽  
V I Zapryagaev ◽  
A L Smirnov ◽  
A V Sobolev
Keyword(s):  
Laser Pulse ◽  
Shock Waves ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Pulse Repetition ◽  
Optical Discharge ◽  
High Laser ◽  
Laser Pulse Repetition Rate

scholarly journals Studies of ablated plasma and shocks produced in a planar target by a sub-nanosecond laser pulse of intensity relevant to shock ignition

2015 ◽  
Vol 33 (3) ◽  
pp. 561-575 ◽  
Author(s):  
J. Badziak ◽  
L. Antonelli ◽  
F. Baffigi ◽  
D. Batani ◽  
T. Chodukowski ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Laser Intensity ◽  
Laser System ◽  
Energy Conversion Efficiency ◽  
Hot Electrons ◽  
Plastic Layer ◽  
Maximum Pressure ◽  
Nanosecond Laser Pulse ◽  
Nanosecond Laser ◽  
Planar Target

AbstractThe effect of laser intensity on characteristics of the plasma ablated from a low-Z (CH) planar target irradiated by a 250 ps, 0.438 µm laser pulse with the intensity of up to 1016 W/cm2 as well as on parameters of the laser-driven shock generated in the target for various scale-lengths of preformed plasma was investigated at the kilojoule Prague Asterix Laser System (PALS) laser facility. Characteristics of the plasma were measured with the use of 3-frame interferometry, ion diagnostics, an X-ray spectrometer, and Kα imaging. Parameters of the shock generated in a Cl doped CH target by the intense 3ω laser pulse were inferred by numerical hydrodynamic simulations from the measurements of craters produced by the shock in the massive Cu target behind the CH layer. It was found that the pressure of the shock generated in the plastic layer is relatively weakly influenced by the preplasma (the pressure drop due to the preplasma presence is ~10–20%) and at the pulse intensity of ~1016 W/cm2 the maximum pressure reaches ~80–90 Mbar. However, an increase in pressure of the shock with the laser intensity is slower than predicted by theory for a planar shock and the maximum pressure achieved in the experiment is by a factor of ~2 lower than predicted by the theory. Both at the preplasma absence and presence, the laser-to-hot electrons energy conversion efficiency is small, ~1% or below, and the influence of hot electrons on the generated shock is expected to be weak.

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