High-power subpicosecond KrF laser system

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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Development of a high-power KrF laser system, ASHURA

Laser and Particle Beams ◽

10.1017/s0263034600007345 ◽

1989 ◽

Vol 7 (3) ◽

pp. 383-392 ◽

Cited By ~ 14

Author(s):

Y. Owadano ◽

I. Okuda ◽

Y. Matsumoto ◽

M. Tanimoto ◽

T. Tomie ◽

...

Keyword(s):

Power Density ◽

High Power ◽

Present Status ◽

Laser System ◽

Maximum Power ◽

Main Amplifier ◽

Krf Laser ◽

Wall Plug Efficiency ◽

Time Pulse

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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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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