Reflection of intense laser light from microstructured targets as a potential diagnostic of laser focus and plasma temperature

J. Jarrett; M. King; R. J. Gray; N. Neumann; L. Dohl; C. D. Baird; T. Ebert; M. Hesse; A. Tebartz; D. R. Rusby; N. C. Woolsey; D. Neely; M. Roth; P. McKenna

doi:10.1017/hpl.2018.63

Reflection of intense laser light from microstructured targets as a potential diagnostic of laser focus and plasma temperature

J. Jarrett, M. King, R. J. Gray, N. Neumann, L. Dohl, C. D. Baird, T. Ebert, M. Hesse, A. Tebartz, D. R. Rusby, N. C. Woolsey, D. Neely, M. Roth, P. McKenna

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Abstract

The spatial-intensity profile of light reflected during the interaction of an intense laser pulse with a microstructured target is investigated experimentally and the potential to apply this as a diagnostic of the interaction physics is explored numerically. Diffraction and speckle patterns are measured in the specularly reflected light in the cases of targets with regular groove and needle-like structures, respectively, highlighting the potential to use this as a diagnostic of the evolving plasma surface. It is shown, via ray-tracing and numerical modelling, that for a laser focal spot diameter smaller than the periodicity of the target structure, the reflected light patterns can potentially be used to diagnose the degree of plasma expansion, and by extension the local plasma temperature, at the focus of the intense laser light. The reflected patterns could also be used to diagnose the size of the laser focal spot during a high intensity interaction when using a regular structure with known spacing.

Original language	English
Number of pages	7
Journal	High Power Laser Science and Engineering
Volume	7
Early online date	27 Dec 2018
DOIs	https://doi.org/10.1017/hpl.2018.63
Publication status	E-pub ahead of print - 27 Dec 2018

Keywords

plasma temperature diagnosis
laser-solid interactions
high power laser

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10.1017/hpl.2018.63Licence: CC BY 4.0

Jarrett-etal-HPLSE-2018-Reflection-of-intense-laser-light-from-microstructured-targetsFinal published version, 504 KBLicence: CC BY 4.0

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Jarrett, J., King, M., Gray, R. J., Neumann, N., Dohl, L., Baird, C. D., Ebert, T., Hesse, M., Tebartz, A., Rusby, D. R., Woolsey, N. C., Neely, D., Roth, M., & McKenna, P. (2018). Reflection of intense laser light from microstructured targets as a potential diagnostic of laser focus and plasma temperature. High Power Laser Science and Engineering, 7. Advance online publication. https://doi.org/10.1017/hpl.2018.63

@article{ff1797330c5a45e6b1878c9b4505bc52,

title = "Reflection of intense laser light from microstructured targets as a potential diagnostic of laser focus and plasma temperature",

abstract = "The spatial-intensity profile of light reflected during the interaction of an intense laser pulse with a microstructured target is investigated experimentally and the potential to apply this as a diagnostic of the interaction physics is explored numerically. Diffraction and speckle patterns are measured in the specularly reflected light in the cases of targets with regular groove and needle-like structures, respectively, highlighting the potential to use this as a diagnostic of the evolving plasma surface. It is shown, via ray-tracing and numerical modelling, that for a laser focal spot diameter smaller than the periodicity of the target structure, the reflected light patterns can potentially be used to diagnose the degree of plasma expansion, and by extension the local plasma temperature, at the focus of the intense laser light. The reflected patterns could also be used to diagnose the size of the laser focal spot during a high intensity interaction when using a regular structure with known spacing.",

keywords = "plasma temperature diagnosis, laser-solid interactions, high power laser",

author = "J. Jarrett and M. King and Gray, {R. J.} and N. Neumann and L. Dohl and Baird, {C. D.} and T. Ebert and M. Hesse and A. Tebartz and Rusby, {D. R.} and Woolsey, {N. C.} and D. Neely and M. Roth and P. McKenna",

year = "2018",

month = dec,

day = "27",

doi = "10.1017/hpl.2018.63",

language = "English",

volume = "7",

journal = "High Power Laser Science and Engineering",

issn = "2095-4719",

publisher = "Cambridge University Press",

}

Jarrett, J, King, M , Gray, RJ, Neumann, N, Dohl, L, Baird, CD, Ebert, T, Hesse, M, Tebartz, A, Rusby, DR, Woolsey, NC, Neely, D, Roth, M & McKenna, P 2018, 'Reflection of intense laser light from microstructured targets as a potential diagnostic of laser focus and plasma temperature', High Power Laser Science and Engineering, vol. 7. https://doi.org/10.1017/hpl.2018.63

TY - JOUR

T1 - Reflection of intense laser light from microstructured targets as a potential diagnostic of laser focus and plasma temperature

AU - Jarrett, J.

AU - King, M.

AU - Gray, R. J.

AU - Neumann, N.

AU - Dohl, L.

AU - Baird, C. D.

AU - Ebert, T.

AU - Hesse, M.

AU - Tebartz, A.

AU - Rusby, D. R.

AU - Woolsey, N. C.

AU - Neely, D.

AU - Roth, M.

AU - McKenna, P.

PY - 2018/12/27

Y1 - 2018/12/27

N2 - The spatial-intensity profile of light reflected during the interaction of an intense laser pulse with a microstructured target is investigated experimentally and the potential to apply this as a diagnostic of the interaction physics is explored numerically. Diffraction and speckle patterns are measured in the specularly reflected light in the cases of targets with regular groove and needle-like structures, respectively, highlighting the potential to use this as a diagnostic of the evolving plasma surface. It is shown, via ray-tracing and numerical modelling, that for a laser focal spot diameter smaller than the periodicity of the target structure, the reflected light patterns can potentially be used to diagnose the degree of plasma expansion, and by extension the local plasma temperature, at the focus of the intense laser light. The reflected patterns could also be used to diagnose the size of the laser focal spot during a high intensity interaction when using a regular structure with known spacing.

AB - The spatial-intensity profile of light reflected during the interaction of an intense laser pulse with a microstructured target is investigated experimentally and the potential to apply this as a diagnostic of the interaction physics is explored numerically. Diffraction and speckle patterns are measured in the specularly reflected light in the cases of targets with regular groove and needle-like structures, respectively, highlighting the potential to use this as a diagnostic of the evolving plasma surface. It is shown, via ray-tracing and numerical modelling, that for a laser focal spot diameter smaller than the periodicity of the target structure, the reflected light patterns can potentially be used to diagnose the degree of plasma expansion, and by extension the local plasma temperature, at the focus of the intense laser light. The reflected patterns could also be used to diagnose the size of the laser focal spot during a high intensity interaction when using a regular structure with known spacing.

KW - plasma temperature diagnosis

KW - laser-solid interactions

KW - high power laser

UR - https://www.cambridge.org/core/journals/high-power-laser-science-and-engineering

U2 - 10.1017/hpl.2018.63

DO - 10.1017/hpl.2018.63

M3 - Article

SN - 2095-4719

VL - 7

JO - High Power Laser Science and Engineering

JF - High Power Laser Science and Engineering

ER -

Reflection of intense laser light from microstructured targets as a potential diagnostic of laser focus and plasma temperature

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Nonlinear Optics and Dynamics of Relativistically Transparent Plasmas

Doctoral Training Partnership (DTP 2016-2017 University of Strathclyde) | Jarrett, Jonathan

Advanced laser-ion acceleration strategies towards next generation healthcare

Data for: "Reflection of intense laser light from microstructured targets as a potential diagnostic of laser focus and plasma temperature"

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Reflection of intense laser light from microstructured targets as a potential diagnostic of laser focus and plasma temperature

Abstract

Keywords

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Other files and links

Fingerprint

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Nonlinear Optics and Dynamics of Relativistically Transparent Plasmas

Doctoral Training Partnership (DTP 2016-2017 University of Strathclyde) | Jarrett, Jonathan

Advanced laser-ion acceleration strategies towards next generation healthcare

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Data for: "Reflection of intense laser light from microstructured targets as a potential diagnostic of laser focus and plasma temperature"

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