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 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 Independent and continuous third-order dispersion compensation using a pair of prisms

2014 ◽  
Vol 2 ◽  
Author(s):  
Qingwei Yang ◽  
Xinglong Xie ◽  
Jun Kang ◽  
Haidong Zhu ◽  
Ailin Guo ◽  
...  
Keyword(s):  
Pulse Duration ◽  
Dispersion Compensation ◽  
Contrast Ratio ◽  
Group Delay Dispersion ◽  
Third Order ◽  
Third Order Dispersion ◽  
Wide Range ◽  
Laser Systems ◽  
Order Dispersion ◽  
Pulse Contrast

Abstract The dispersion of a pair of prisms is analyzed by means of a ray-tracing method operating at other than tip-to-tip propagation of the prisms, taking into consideration the limited spectral bandwidth. The variations of the group delay dispersion and the third-order dispersion for a pair of prisms are calculated with respect to the incident position and the separation between the prisms. The pair of prisms can provide a wide range of independent and continuous third-order dispersion compensation. The effect of residual third-order dispersion on the pulse contrast ratio and pulse duration is also calculated. The residual third-order dispersion not only worsens the pulse contrast ratio, but also increases the pulse duration to the hundreds of femtosecond range for a tens of femtosecond pulse, even when the residual third-order dispersion is small. These phenomena are helpful in compensating for the residual high-order dispersion and in understanding its effect on pulse contrast ratios and pulse durations in ultrashort laser systems.

scholarly journals New criteria for efficient Raman and Brillouin amplification of laser beams in plasma

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
R. M. G. M. Trines ◽  
E. P. Alves ◽  
E. Webb ◽  
J. Vieira ◽  
F. Fiúza ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Pulse Amplitude ◽  
Laser Beams ◽  
Seed Pulse ◽  
Coupling Constant ◽  
Minimum Threshold ◽  
The Poor ◽  
Laser Systems ◽  
Initial Seed ◽  
New Criteria

AbstractRaman or Brillouin amplification of a laser beam in plasma has long been seen as a way to reach multi-PW powers in compact laser systems. However, no significant plasma-based Raman amplification of a laser pulse beyond 0.1 TW has been achieved in nearly 20 years, and only one report of Brillouin amplification beyond 1 TW. In this paper, we reveal novel non-linear criteria for the initial seed pulse that will finally open the door to efficient Raman and Brillouin amplification to petawatt powers and Joule-level energies. We show that the triple product of the coupling constant $$\Gamma $$ Γ , seed pulse duration $$\tau $$ τ and seed pulse amplitude a for the Raman seed pulse (or $$a^{2/3}$$ a 2 / 3 for Brillouin) must exceed a specific minimum threshold for efficient amplification. We also analyze the plasma-based Raman and Brillouin amplification experiments to date, and show that the seed pulses used in nearly all experiments are well below our new threshold, which explains the poor efficiency obtained in them. Finally, we analyze a recent Brillouin amplification experiment that used increased seed pulse power to obtain Joule-level amplification, and find excellent agreement with our theory.

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.

Study of femtosecond laser pulse induced shockwave in aluminum-coated dielectric target

2020 ◽  
Vol 91 (1) ◽  
pp. 10801
Author(s):  
Chuliang Zhou ◽  
Yafeng Bai ◽  
Zhongpeng Li ◽  
Yingying Ding ◽  
Haiyi Sun ◽  
...  
Keyword(s):  
Shock Wave ◽  
Laser Pulse ◽  
Femtosecond Laser ◽  
Time Scale ◽  
Laser Energy ◽  
Contrast Ratio ◽  
Nanosecond Time Scale ◽  
Dielectric Target ◽  
Overdense Plasma ◽  
Scale Length

The influence of the preplasma on laser induced shockwave in the laser and aluminum-coated planar dielectric target interaction at vacuum has been investigated with the shadowgraphy method. While the laser irradiate on the aluminum-coated dielectric target at intensity of about 1017 W/cm2, the metallic layers absorb laser energy, evaporate and ionize into plasma, it is verified that the scale length of laser-produced plasma is dramatically dependent on the contrast ratio of femtosecond-laser while the main laser pulse energy is almost kept. The characteristics of laser induced shock wave in nanosecond time scale were studied. In the nanosecond time scale, shock wave is only observed in the case of relatively short plasma scale length. This result can be explained by the dissipation of the shock wave during its propagation in the preplasma. In addition, we performed numerical simulation with MULTI2D to get an insight into the propagation of shock wave in the overdense plasma [R. Ramis, J. Meyer-ter-Vehn, and J. Ramírez, Comput. Phys. Commun. 180, 977 (2009)].

Improvement of laser pulse contrast by optical Kerr shutter

2011 ◽  
Vol 19 (2) ◽  
pp. 470-474
Author(s):  
贺俊芳 HE Jun-fang ◽  
吴登科 WU Deng-ke ◽  
王屹山 WANG Yi-shan ◽  
朱长军 ZHU Chang-jun ◽  
吴真 WU Zhen
Keyword(s):  
Laser Pulse ◽  
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

High-dynamic-range laser-pulse-contrast measurement with a plasma-shuttered streak camera

1997 ◽  
Vol 22 (20) ◽  
pp. 1559 ◽  
Author(s):  
An-Chun Tien ◽  
Marc Nantel ◽  
Gérard Mourou ◽  
Daniel Kaplan ◽  
Marcel Bouvier
Keyword(s):  
Laser Pulse ◽  
Dynamic Range ◽  
Streak Camera ◽  
High Dynamic Range ◽  
High Dynamic ◽  
Contrast Measurement ◽  
Pulse Contrast
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