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Images
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USP
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Specifications:
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- M2 = 1.5 diffraction limit
- 1 J, 100 fs, 10 TW, 0.0056 Hz (1996)
- 800 nm, 400 nm
- 5 ´ 1019 W cm-2
- pulse contrast < 10-7 at t = 1 ps (high contrast)
- 10 J, 30-100 fs, 300 TW, 0.0056 Hz, 1021 W cm-2 (in development)
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- Laser on optical table
from The Physics & Space Technology USP and Janus Lasers
- Target chamber
from The Physics & Space Technology USP and Janus Lasers
- Diagram
- Oscillator, 100 fs, 4 nJ
from USP site
- Stretcher compensates for 3rd and 4th order phase distortion using special doublet optics
from USP site
- Regenerative amplification gives extremely low ASE and amplification to 8 mJ.
Amplification consists of two stages of Glan polarizer - Pockel cell isolation in 12 passses.
from USP site
- 400 mJ, 10 Hz 5-pass Nd:YAG pumped rod amplifier and 2 J, 2-pass Nd:glass pumped disk amplifier.
There are Pockels cell switches between each amplification stage to control the number of passes.
from USP site
- Vacuum compressor and off axis parabolic mirror
from USP site
- Frequency doubling to 400 nm and an adjustable stretcher give < 1 ´ 10-7 contrast at 1 ps before peak of the USP laser pulse.
from USP site
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X-ray spectra of USP produced high temperature (> 500 eV) germanium target plasma at near solid density.
Note the increase in number of transitions in USP plasma compared to longer pulse length laser (bottom).
from Plasma Experiments with USP
- Diagram of subpicosecond streak camera and imaging spectrometer
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X-rays from slab targets heated by 130 fs USP laser at 400 nm, near solid density plasmas at
5 ´ 1017 W cm-2.
1 mm of Al, Si, Ti, Mn, Fe, Cu, Ge, or Ag coated onto a polished microscope slide.
Comparison with LASNEX.
B.K.F. Young, R.L. Shepherd, S.J. Shiromizu, D.E. Nelson, D.F. Price, J.D. Bonlie, M.E. Foord, B.G. Wilson, P.T. Springer (Lawrence Livermore National Laboratory)
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UTA Spectroscopy as a Signature of the Transition from LTE to NLTE, 100 fs, 1019 W cm-2.
Jiang, Z., Kieffer, J.-C., Gallant, P., Forget, P. (INRS-energie et materiaux, Univ. du Quebec, Quebec, Canada),
Shepherd,R., Foord,M., Goldstein, W. (Lawrence Livermore National Laboratory, California, USA)
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Spectroscopic analysis of thin foils heated with USP, 150 fs (FWHM), 200 mJ
3 mm spot size, 1.9 ´ 1019 W cm-2.
Shepherd, R., Young, B., More, R., Price, D., Osterheld, A., Iglesias, C., Walling, R., Guethlein, G.,
Stewart, R. (V-Division, Lawrence Livermore National Laboratory, P.O. Box 808, Livermore Ca., 94550),
Kato,T.
(National Institute for Fusion Sciences, Nagoya, Japan)
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