On-target contrast diagnostic via specular reflectivity measurement

A. S. Pirozhkov, I. W. Choi, J. H. Sung, S. K. Lee, T. J. Yu, T. M. Jeong, I. J. Kim, N. Hafz, C. M. Kim, K. H. Pae, Y. C. Noh, D.-K. Ko, J. Lee, A. Robinson, P. Foster, S. Hawkes, M. Streeter, C. Spindloe, P. McKenna, D. C. CarrollC.-G. Wahlström, M. Zepf, B. Dromey, K. Markey, S. Kar, Y. T. Li, M. H. Xu, H. Nagatomo, M. Mori, A. Yogo, H. Kiriyama, K. Ogura, A. Sagisaka, S. Orimo, M. Nishiuchi, H. Sugiyama, T. Zh. Esirkepov, H. Okada, S. Kondo, S. Kanazawa, Y. Nakai, A. Akutsu, T. Motomura, M. Tanoue, T. Shimomura, M. Ikegami, I. Daito, M. Kando, T. Kameshima, P. Bolton, S. V. Bulanov, H. Daido, D. Neely

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

6 Downloads (Pure)

Abstract

High-power laser contrast is challenging to measure, especially in the real target irradiation conditions. We present a convenient and relatively simple contrast diagnostic technique based on the measurement of target specular reflectivity at full laser power. The reflectivity remains high even at intensities above l019W/cm2 in the case of a high-contrast prepulse-free laser. On the contrary, the specular reflectivity drops in the case of lower contrast, due to the beam break-up and increased absorption caused by the preformed plasma. The technique was demonstrated using three different laser systems with several contrast conditions: Astra (CLF, RAL), TiS laser at APRI, GIST, and J-KAREN (APRC, JAEA).

Original languageEnglish
Title of host publicationLaser-Driven Relativistic Plasmas Applied to Science, Industry and Medicine - The 2nd International Symposium
Pages7-15
Number of pages9
Volume1153
DOIs
Publication statusPublished - 25 Nov 2009
Event2nd International Symposium on Laser-Driven Relativistic Plasmas Applied to Science, Industry and Medicine - Kyoto, Japan
Duration: 19 Jan 200923 Jan 2009

Conference

Conference2nd International Symposium on Laser-Driven Relativistic Plasmas Applied to Science, Industry and Medicine
CountryJapan
CityKyoto
Period19/01/0923/01/09

Keywords

  • contrast diagnostics
  • high-power laser contrast
  • relativistic laser plasma

Cite this