Illumination uniformity requirements for direct-drive inertial confinement fusion

Joshua E. Rothenberg; David Eimerl; Michael H. Key; Stephen V. Weber

doi:10.1117/12.228250

8 December 1995 Illumination uniformity requirements for direct-drive inertial confinement fusion

Joshua E. Rothenberg, David Eimerl, Michael H. Key, Stephen V. Weber

Proceedings Volume 2633, Solid State Lasers for Application to Inertial Confinement Fusion (ICF); (1995) https://doi.org/10.1117/12.228250
Event: Solid State Lasers for Application to Inertial Confinement Fusion (ICF), 1995, Monterey, CA, United States

Abstract

The requirements for laser uniformity are discussed in terms of the l-mode spectrum. It is shown that the choice of smoothing methods can significantly alter this spectrum and that this choice should be made in the context of the target physics. Although two dimensional smoothing by spectral dispersion yields a high quality near field beam profile, it results in poor smoothing for low spatial frequency. The partially coherent light method (fiber smoothing) leads to superior smoothing at low spatial frequencies, but has very poor near field beam quality. As a result, it may be desirable to use partially coherent light during the drive pulse foot (at low intensity and when minimizing the laser imprint is critical) and smoothing by spectral dispersion during the main pulse.

Citation Download Citation

Joshua E. Rothenberg, David Eimerl, Michael H. Key, and Stephen V. Weber "Illumination uniformity requirements for direct-drive inertial confinement fusion", Proc. SPIE 2633, Solid State Lasers for Application to Inertial Confinement Fusion (ICF), (8 December 1995); https://doi.org/10.1117/12.228250

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