@article{7c09eeb808d2473d8fc18d3d7d84d140,
title = "Characteristics of target interaction with high power UV laser radiation",
abstract = "Thermal conduction, mass ablation rate, pressure and preheat were investigated in the interaction of a frequency tripled Nd: glass laser of power 0.-0.2 TW with flat targets. In the range 1013-1015 W cm2 for 400 ps pulses we find: (a) thermal conduction may be described by a flux limiter f = 0.04 ± 0.01; (b) the mass abaltion rate depends on the incident laser irradiance as m{\^ } = 4.4 × 105 (I/1014)0.53 g cm-2 s-1; (c) the pressure near the ablation surface increases approximately linearly with irradiance and is about 70 Mbar at 1015 W/cm2, and (d) preheat as evidenced by Kα X-ray line emission is significantly lower than in λ = 1.05 μm irradiation.",
author = "B. Yaakobi and T. Boehly and P. Bourke and Y. Conturie and Craxton, {R. S.} and J. Delettrez and Forsyth, {J. M.} and Frankel, {R. D.} and Goldman, {L. M.} and McCrory, {R. L.} and Richardson, {M. C.} and W. Seka and D. Shvarts and Soures, {J. M.}",
note = "Funding Information: Short-wavelength high-power lasers are currently the subject of great interest as potential laser fusion drivers, because of their better target interaction properties [ l-41. We study here four such properties: thermal conduction (transport), mass ablation rate, pressure near the ablation surface and preheat. The laser used in these experimenst is the frequency-triplet @ = 0.35 pm) single-beam Glass Development Laser [S] , producing 400 ps pulses of up to 60 J (100 ps, 20 J pulses in some of the experiments). The irradiance of flat targets was varied in the range 1013-1015 W/cm2 by changing the energy and focal spot size. As compared with the same irradiance at X = 1.05 pm we find greatly increased mass ablation rate, greatly reduced preheat, and thermal transport described by a similar flux limiter. The thermal conduction was determined from measurements of silicon X-ray lines emitted by a flat glass substrate .overcoated with layers of plastic (parylene) of various thicknesses. Fig. 1 shows the results for the 1~2-1~2~ line of Si+l2 at 1.86 keV, using 400 ps pulses at 1015 W/cm2. The spectra were recorded on calibrated Kodak RAR-2497 film after diffraction off a flat gyp- * This work is supported by the U.S. Department of Energy in-ertial fusion project under contract No. DE-AC0880DP40124. {\textquoteright} Permanent address: NRCN, P.O. Box 9001, BeerSheva, Israel.",
year = "1981",
month = oct,
day = "1",
doi = "10.1016/0030-4018(81)90050-X",
language = "English",
volume = "39",
pages = "175--179",
journal = "Optics Communications",
issn = "0030-4018",
publisher = "Elsevier",
number = "3",
}