Evaluation of the effect of prepulses on HF laser-target interactions

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We have assessed the effect of multinanosecond, low-power-density prepulses on the interaction of multinanosecond, 10/sup 14/ W/cm/sup 2/, approx. 3 -..mu..m HF laser pulses with slab targets. The emphasis is on analyzing absorption and x-ray conversion efficiency. A survey of previous experiments gives no evidence that these prepulses will affect the total absorption. However, prepulses have been observed to cause qualitative changes in both the x-ray spectrum and conversion efficiency. Numerical simulations indicate that the laser-target interaction is effectively insensitive to low-power-density prepulses. These studies imply that basic laser-target experiments with multiplexed, HF laser pulses will provide an important characterization ... continued below

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Pages: 27

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Matzen, M.K. June 1, 1979.

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Description

We have assessed the effect of multinanosecond, low-power-density prepulses on the interaction of multinanosecond, 10/sup 14/ W/cm/sup 2/, approx. 3 -..mu..m HF laser pulses with slab targets. The emphasis is on analyzing absorption and x-ray conversion efficiency. A survey of previous experiments gives no evidence that these prepulses will affect the total absorption. However, prepulses have been observed to cause qualitative changes in both the x-ray spectrum and conversion efficiency. Numerical simulations indicate that the laser-target interaction is effectively insensitive to low-power-density prepulses. These studies imply that basic laser-target experiments with multiplexed, HF laser pulses will provide an important characterization of the interaction of long pulse, multi-line, approx. 3 ..mu..m radiation with targets. Future wavelength comparison experiments will require prepulse suppression or target isolation.

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Pages: 27

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Dep. NTIS, PC A03/MF A01.

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  • Report No.: SAND-79-0353
  • Grant Number: EY-76-C-04-0789
  • DOI: 10.2172/6245179 | External Link
  • Office of Scientific & Technical Information Report Number: 6245179
  • Archival Resource Key: ark:/67531/metadc1110763

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Creation Date

  • June 1, 1979

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

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  • March 20, 2018, 8:33 p.m.

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Matzen, M.K. Evaluation of the effect of prepulses on HF laser-target interactions, report, June 1, 1979; United States. (digital.library.unt.edu/ark:/67531/metadc1110763/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.