Simulations of the propagation of multiple-FM smoothing by spectral dispersion on OMEGA EP

Kelly, J. H.; Shvydky, A.; Marozas, J. A.; Guardalben, M. J.; Kruschwitz, B. E.; Waxer, L. J.; Dorrer, C.; Hill, E.; Okishev, A. V.; Di Nicola, J.-M.

doi:10.1117/12.2003209

Title: Simulations of the propagation of multiple-FM smoothing by spectral dispersion on OMEGA EP

Abstract

A one-dimensional (1-D) smoothing by spectral dispersion (SSD) system for smoothing focal-spot nonuniformities using multiple modulation frequencies has been commissioned on one long-pulse beamline of OMEGA EP, the first use of such a system in a high-energy laser. Frequency modulation (FM) to amplitude modulation (AM) conversion in the infrared (IR) output, frequency conversion, and final optics affected the accumulation of B-integral in that beamline. Modeling of this FM-to-AM conversion using the code Miró. was used as input to set the beamline performance limits for picket (short) pulses with multi-FM SSD applied. This article first describes that modeling. The 1-D SSD analytical model of Chuang is first extended to the case of multiple modulators and then used to benchmark Miró simulations. Comparison is also made to an alternative analytic model developed by Hocquet et al. With the confidence engendered by this benchmarking, Miró results for multi-FM SSD applied on OMEGA EP are then presented. The relevant output section(s) of the OMEGA EP Laser System are described. The additional B-integral in OMEGA EP IR components upstream of the frequency converters due to AM is modeled. The importance of locating the image of the SSD dispersion grating at the frequency converters is demonstrated.more »« less

Authors:

Kelly, J. H. ^[1]; Shvydky, A. ^[1]; Marozas, J. A. ^[1]; Guardalben, M. J. ^[1]; Kruschwitz, B. E. ^[1]; Waxer, L. J. ^[1]; Dorrer, C. ^[1]; Hill, E. ^[1]; Okishev, A. V. ^[1]; Di Nicola, J.-M. ^[2]

Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Publication Date:: Mon Feb 18 00:00:00 EST 2013

Research Org.:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1087590

Report Number(s):: DOE/NA/28302-1122
Journal ID: ISSN 0277-786X; 2012-127; 2094

Grant/Contract Number:: FC52-08NA28302

Resource Type:: Accepted Manuscript

Journal Name:: Proceedings of SPIE - The International Society for Optical Engineering

Additional Journal Information:: Journal Volume: 8602; Conference: LASE Photonics West, San Francisco, CA (United States), 2-7 Feb 2013; Journal ID: ISSN 0277-786X

Publisher:: SPIE

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; fusion lasers; beam smoothing; SSD; polar-drive; dispersion; Miro; simulations; B-integral; beam conditioning

Citation Formats


                    Kelly, J. H., Shvydky, A., Marozas, J. A., Guardalben, M. J., Kruschwitz, B. E., Waxer, L. J., Dorrer, C., Hill, E., Okishev, A. V., and Di Nicola, J.-M. Simulations of the propagation of multiple-FM smoothing by spectral dispersion on OMEGA EP.  United States: N. p., 2013. 
Web.  doi:10.1117/12.2003209.

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                    Kelly, J. H., Shvydky, A., Marozas, J. A., Guardalben, M. J., Kruschwitz, B. E., Waxer, L. J., Dorrer, C., Hill, E., Okishev, A. V., & Di Nicola, J.-M. Simulations of the propagation of multiple-FM smoothing by spectral dispersion on OMEGA EP.  United States.  https://doi.org/10.1117/12.2003209

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                    Kelly, J. H., Shvydky, A., Marozas, J. A., Guardalben, M. J., Kruschwitz, B. E., Waxer, L. J., Dorrer, C., Hill, E., Okishev, A. V., and Di Nicola, J.-M. Mon .  
"Simulations of the propagation of multiple-FM smoothing by spectral dispersion on OMEGA EP".  United States.  https://doi.org/10.1117/12.2003209.  https://www.osti.gov/servlets/purl/1087590.

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@article{osti_1087590,

  title        = {Simulations of the propagation of multiple-FM smoothing by spectral dispersion on OMEGA EP},

  author       = {Kelly, J. H. and Shvydky, A. and Marozas, J. A. and Guardalben, M. J. and Kruschwitz, B. E. and Waxer, L. J. and Dorrer, C. and Hill, E. and Okishev, A. V. and Di Nicola, J.-M.},

  abstractNote = {A one-dimensional (1-D) smoothing by spectral dispersion (SSD) system for smoothing focal-spot nonuniformities using multiple modulation frequencies has been commissioned on one long-pulse beamline of OMEGA EP, the first use of such a system in a high-energy laser. Frequency modulation (FM) to amplitude modulation (AM) conversion in the infrared (IR) output, frequency conversion, and final optics affected the accumulation of B-integral in that beamline. Modeling of this FM-to-AM conversion using the code Miró. was used as input to set the beamline performance limits for picket (short) pulses with multi-FM SSD applied. This article first describes that modeling. The 1-D SSD analytical model of Chuang is first extended to the case of multiple modulators and then used to benchmark Miró simulations. Comparison is also made to an alternative analytic model developed by Hocquet et al. With the confidence engendered by this benchmarking, Miró results for multi-FM SSD applied on OMEGA EP are then presented. The relevant output section(s) of the OMEGA EP Laser System are described. The additional B-integral in OMEGA EP IR components upstream of the frequency converters due to AM is modeled. The importance of locating the image of the SSD dispersion grating at the frequency converters is demonstrated. In conclusion, since frequency conversion is not performed in OMEGA EP’s target chamber, the additional AM due to propagation to the target chamber’s vacuum window is modeled.},

  doi          = {10.1117/12.2003209},

  journal      = {Proceedings of SPIE - The International Society for Optical Engineering},

  number       = ,

  volume       = 8602,

  place        = {United States},

  year         = {Mon Feb 18 00:00:00 EST 2013},

  month        = {Mon Feb 18 00:00:00 EST 2013}

}

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Title: Simulations of the propagation of multiple-FM smoothing by spectral dispersion on OMEGA EP

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