超高出力レーザー用ホログラフィックプラズマレンズの開発(Holographic plasma lenses for ultra-high-power lasers)

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2022-03-14 アメリカ・ローレンスリバモア国立研究所(LLNL)

世界最高エネルギーのレーザー装置である国立点火施設(NIF)では、増幅器、ミラー、波長変換器、集光レンズなど、一連の複雑なガラス光学系がレーザー光を強化し、目的地まで導いている。NIFの強力なレーザービームから生み出される強烈なエネルギーに耐えられるよう、研究者は長年にわたってこれらの光学部品を開発し、改良してきた。

超高出力レーザー用ホログラフィックプラズマレンズの開発(Holographic plasma lenses for ultra-high-power lasers)

Colorized illustration from a simulation of a holographic plasma lens. The red concentric circles denote alternating high- and low-density plasma rings. The blue dot at the center represents the focused light. Image by Matthew Edwards/LLNL.


ホログラフィックプラズマレンズ Holographic Plasma Lenses

M. R. Edwards, V. R. Munirov, A. Singh, N. M. Fasano, E. Kur, N. Lemos, J. M. Mikhailova, J. S. Wurtele, and P. Michel

Phys. Rev. Lett. 128, 065003 – Published 8 February 2022

DOI:https://doi.org/10.1103/PhysRevLett.128.065003 © 2022 American Physical Society

ABSTRACT

A hologram fully encodes a three-dimensional light field by imprinting the interference between the field and a reference beam in a recording medium. Here we show that two collinear pump lasers with different foci overlapped in a gas jet produce a holographic plasma lens capable of focusing or collimating a probe laser at intensities several orders-of-magnitude higher than the limits of a nonionized optic. We outline the theory of these diffractive plasma lenses and present simulations for two plasma mechanisms that allow their construction: spatially varying ionization and ponderomotively driven ion-density fluctuations. Damage-resistant plasma optics are necessary for manipulating high-intensity light, and divergence control of high-intensity pulses—provided by holographic plasma lenses—will be a critical component of high-power plasma-based lasers.

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2000原子力放射線一般
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