Theory and simulation of Raman scattering in intense short-pulse laser-plasma interactions

Conference · Sat Jun 01 04:00:00 EDT 1991 · Proceedings of SPIE - The International Society for Optical Engineering

DOI:https://doi.org/10.1117/12.46145· OSTI ID:6037349

Wilks, Scott C. ^[1]; Kruer, William L. ^[1]; Langdon, A. B. ^[1]; Amendt, Peter A. ^[1]; Eder, David C. ^[1]; Keane, Christopher J. ^[1]

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1. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

We report on the stimulated Raman scattering (SRS) that occurs when short (~ 50-100 femtoseconds), intense (I ~ 2 Xl0¹⁷ W/cm²) laser pulses are focused into a plasma, or a neutral gas which quickly becomes a plasma due to multiphoton ionization. Review of the usual SRS growth rates will be given, followed by a discussion on how this theory is modified for short pulses. It is found that for some recombination x-ray laser schemes employing short pulses, the Raman instability can potentially heat the electrons to levels that would greatly reduce the efficiency of such a device. However, there are areas in parameter space where the temperature of heated electrons can be kept to acceptable levels. One dimensional, relativistic, particle-in-cell (PIC) simulations are presented.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6037349
• Report Number(s): UCRL-JC--106277; CONF-910123--15; ON: DE91008734
• Conference Information: Journal Name: Proceedings of SPIE - The International Society for Optical Engineering Journal Volume: 1413
• Country of Publication: United States
• Language: English

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74 ATOMIC AND MOLECULAR PHYSICS
INSTABILITY
IONIZATION
LASER-PRODUCED PLASMA
LASERS
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PLASMA INSTABILITY
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RAMAN EFFECT
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