Thomson scattering measurements in optically ionized gases produced by high-intensity KrF laser radiation

Allen A. Offenberger; W. J. Blyth; Michael H. Key; J. Wark; Z. Najmudin; A. E. Dangor

doi:10.1117/12.147564

8 July 1993 Thomson scattering measurements in optically ionized gases produced by high-intensity KrF laser radiation

Allen A. Offenberger, W. J. Blyth, Michael H. Key, J. Wark, Z. Najmudin, A. E. Dangor

Proceedings Volume 1860, Short-Pulse High-Intensity Lasers and Applications II; (1993) https://doi.org/10.1117/12.147564
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

Experiments are reported on optical ionization of gases produced by 12 ps pulses of focused KrF laser radiation at intensities of 3 X 10¹⁷ W/cm². Simultaneous measurements of Thomson, stimulated Raman and stimulated Brillouin scattering have been used to determine the electron energy distribution and temperature in He and Ne (static and pulsed gas jet targets) at pressures of 10^-3 - 1 bar. The electron velocity distribution evolves from a multiphoton ionization spectrum at low pressure to a thermal electron distribution at higher pressure. The ion determined portion of the Thomson scattered spectrum is highly non-thermal for pressures > a few mbar. At high pressure, significant Raman and Brillouin backscattering are observed. The results show that inverse bremsstrahlung absorption dominates heating for p > 10^-2 bar except at the highest pressures where SRS may also be important.

Citation Download Citation

Allen A. Offenberger, W. J. Blyth, Michael H. Key, J. Wark, Z. Najmudin, and A. E. Dangor "Thomson scattering measurements in optically ionized gases produced by high-intensity KrF laser radiation", Proc. SPIE 1860, Short-Pulse High-Intensity Lasers and Applications II, (8 July 1993); https://doi.org/10.1117/12.147564

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