SSD with generalized phase modulation
Smoothing by spectral dispersion (SSD) with standard frequency modulation (FM), although simple to implement, has the disadvantage that low spatial frequencies present in the spectrum of the target illumination are not smoothed as effectively as with a more general smoothing method (eg, induced spatial incoherence method). The reduced smoothing performance of standard FM-SSD can result in spectral power of the speckle noise at these low spatial frequencies as much as one order of magnitude larger than that achieved with a more general method. In fact, at small integration times FM-SSD has no smoothing effect at all for a broad band of low spatial frequencies. This effect may have important implications for both direct and indirect drive ICF.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 237412
- Report Number(s):
- UCRL-ID-123083; ON: DE96010383; TRN: 96:014530
- Resource Relation:
- Other Information: PBD: 9 Jan 1996
- Country of Publication:
- United States
- Language:
- English
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LLE Review 114 (January-March 2008)
Improved beam smoothing with SSD using generalized phase modulation