Development of a high-power KrF laser system, ASHURA

The present status of the development of a high-power KrF laser system, Ashura, is described. The main amplifier has generated 710 J (95 ns) at the pumping density of 1·lMW/cm3 with the wall plug efficiency of 2·0%. Maximum power of 9·0 GW (200 J/22 ns) per beam has been obtained from the beam lines of six-time pulse multiplexing. Power density of 1 × 1014 W/cm2 has been achieved on target with a 10−6 pre-pulse.

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Limiting Power of High Power Microwave Pulses from Aperture

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.383-390.638 ◽

2011 ◽

Vol 383-390 ◽

pp. 638-642

Author(s):

Jian Hua Zhang ◽

Wei Hu

Keyword(s):

Power Density ◽

High Power ◽

Equivalence Principle ◽

Pulsed Power ◽

Maximum Power ◽

Center Frequency ◽

Aperture Antenna ◽

High Power Microwave ◽

Air Breakdown ◽

Power Microwave

Based on the field equivalence principle and the potential function, the axial normalized pulsed power density of the microwave radiated from the circle aperture antenna was deduced. The power density in the Fresnel region was calculated for uniform aperture and tapered one. The relations between the aperture antenna’s maximum power and the parameters including pulse width, aperture radius and the center frequency were analyzed. The formula of the antenna’s maximum power limited by the air breakdown due to high power microwave is presented.

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Active Stabilization of the Beam Pointing of a High- Power KrF Laser System

Metrology and Measurement Systems ◽

10.1515/mms-2015-0014 ◽

2015 ◽

Vol 22 (1) ◽

pp. 165-172 ◽

Cited By ~ 5

Author(s):

A. Barna ◽

I. B. Földes ◽

J. Bohus ◽

S. Szatmári

Keyword(s):

High Power ◽

Laser System ◽

Spot Size ◽

Electric Signal ◽

Simple Arrangement ◽

Krf Laser ◽

Active Stabilization ◽

Directional Change ◽

Position Sensitive Detectors

Abstract An active beam-pointing stabilization system has been developed for a high-power KrF laser system to eliminate the long-term drift of the directional change of the beam in order to have a stable focusing to a high intensity. The control of the beam direction was achieved by a motor-driven mirror activated by an electric signal obtained by monitoring the position of the focus of the output beam. Instead of large sized UV-sensitive position sensitive detectors a simple arrangement with scatter plates and photodiodes are used to measure the directionality of the beam. After the beam stabilization the long-term residual deviation of the laser shots is ~14 μrad, which is comparable to the shot-to-shot variation of the beam (~12 μrad). This deviation is small enough to keep the focal spot size in a micrometer range when tightly focusing the beam using off-axis parabolic mirrors.

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The design of high-power multistage KrF laser system "GARPUN"

Conference on Lasers and Electro-Optics Europe ◽

10.1109/cleoe.1994.636517 ◽

2005 ◽

Author(s):

N.G. Basov ◽

V.G. Bakaev ◽

G.E. Metreveli ◽

G.V. Sychugov ◽

A.D. Vadkovskii ◽

...

Keyword(s):

High Power ◽

Laser System ◽

Krf Laser

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Efficient High Power-Density Operation Regime of KrF*-Laser Amplifiers for Fusion Driver

Japanese Journal of Applied Physics ◽

10.1143/jjap.24.l311 ◽

1985 ◽

Vol 24 (Part 2, No. 5) ◽

pp. L311-L313 ◽

Cited By ~ 9

Author(s):

Mitsumori Tanimoto ◽

Akira Yaoita ◽

Isao Okuda ◽

Yoshirou Owadano

Keyword(s):

Power Density ◽

High Power ◽

High Power Density ◽

Operation Regime ◽

Laser Amplifiers ◽

Krf Laser

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High-power subpicosecond KrF laser system

Conference on Lasers and Electro-Optics ◽

10.1364/cleo.1986.tuc3 ◽

1986 ◽

Author(s):

I. A. McIntyre ◽

A. P. Schwarzenbach ◽

T. S. Luk ◽

A. McPherson ◽

K. Boyer ◽

...

Keyword(s):

High Power ◽

Laser System ◽

Krf Laser

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Picosecond high power KrF laser system for X-ray laser research

Laser and Particle Beams ◽

10.1017/s0263034600008041 ◽

1990 ◽

Vol 8 (1-2) ◽

pp. 299-306 ◽

Cited By ~ 2

Author(s):

T. Tomie ◽

I. Okuda ◽

Y. Owadano ◽

M. Tanimoto ◽

Y. Matsumoto ◽

...

Keyword(s):

Energy Density ◽

Total Energy ◽

High Power ◽

Recovery Time ◽

Laser System ◽

Detailed Design ◽

X Ray ◽

Fundamental Parameters ◽

Krf Laser ◽

Gain Recovery

Fundamental parameters are studied for the detailed design of a picosecond high power KrF laser system. The saturation energy density of 2.3 mJ/cm2 and gain recovery time of 1.9 ns in an e-beam pumped KrF laser are observed. A 6 ps pulse is amplified to 1.9 J. The system at the Electrotechnical Laboratory is expected to deliver 10 ps pulses with total energy of several tens of joules in several beams.

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