Beam cleaning of an incoherent laser via plasma Raman amplification

doi:10.1063/1.4997246

Title: Beam cleaning of an incoherent laser via plasma Raman amplification

We show that backward Raman amplification in plasma can efficiently compress a temporally incoherent pump laser into an intense coherent amplified seed pulse, provided that the correlation time of the pump is longer than the inverse plasma frequency. One analytical theory for Raman amplification using pump beams with different correlation functions is developed and compared to numerical calculations and particle-in-cell simulations. Since incoherence on scales shorter than the instability growth time suppresses spontaneous noise amplification, we point out a broad regime where quasi-coherent sources may be used as efficient low-noise Raman amplification pumps. As the amplified seed is coherent, Raman amplification provides an additional a beam-cleaning mechanism for removing incoherence. At near-infrared wavelengths, finite coherence times as short as 50 fs allow amplification with only minor losses in efficiency.

Authors:

; ; Mikhailova, Julia M. ^[1] ;

Princeton Univ., NJ (United States). Dept. of Mechanical and Aerospace Engineering
Princeton Univ., NJ (United States). Dept. of Astrophysical Sciences

Publication Date:: 2017-09-25

Grant/Contract Number:: 1506372; FA9550-15-1-0391; NA0002948

Type:: Accepted Manuscript

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Volume: 24; Journal Issue: 10; Journal ID: ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)

Research Org:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

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

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

OSTI Identifier:: 1395338


                    Edwards, Matthew R., Qu, Kenan, Mikhailova, Julia M., and Fisch, Nathaniel J.. Beam cleaning of an incoherent laser via plasma Raman amplification.  United States: N. p.,  
        Web.  doi:10.1063/1.4997246.

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                    Edwards, Matthew R., Qu, Kenan, Mikhailova, Julia M., & Fisch, Nathaniel J.. Beam cleaning of an incoherent laser via plasma Raman amplification.  United States.  doi:10.1063/1.4997246.

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                    Edwards, Matthew R., Qu, Kenan, Mikhailova, Julia M., and Fisch, Nathaniel J.. 2017.  
        "Beam cleaning of an incoherent laser via plasma Raman amplification".  United States.  
        doi:10.1063/1.4997246.  https://www.osti.gov/servlets/purl/1395338.

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@article{osti_1395338,

  title        = {Beam cleaning of an incoherent laser via plasma Raman amplification},

  author       = {Edwards, Matthew R. and Qu, Kenan and Mikhailova, Julia M. and Fisch, Nathaniel J.},

  abstractNote = {We show that backward Raman amplification in plasma can efficiently compress a temporally incoherent pump laser into an intense coherent amplified seed pulse, provided that the correlation time of the pump is longer than the inverse plasma frequency. One analytical theory for Raman amplification using pump beams with different correlation functions is developed and compared to numerical calculations and particle-in-cell simulations. Since incoherence on scales shorter than the instability growth time suppresses spontaneous noise amplification, we point out a broad regime where quasi-coherent sources may be used as efficient low-noise Raman amplification pumps. As the amplified seed is coherent, Raman amplification provides an additional a beam-cleaning mechanism for removing incoherence. At near-infrared wavelengths, finite coherence times as short as 50 fs allow amplification with only minor losses in efficiency.},

  doi          = {10.1063/1.4997246},

  journal      = {Physics of Plasmas},

  number       = 10,

  volume       = 24,

  place        = {United States},

  year         = {2017},

  month        = {9}

}

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10.1063/1.4997246
https://doi.org/10.1063/1.4997246

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Works referenced in this record:

Compression of amplified chirped optical pulses
journal, October 1985

Strickland, Donna; Mourou, Gerard
Optics Communications, Vol. 55, Issue 6, p. 447-449
DOI: 10.1016/0030-4018(85)90151-8

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Title: Beam cleaning of an incoherent laser via plasma Raman amplification

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