Open AccessIntense water-window soft x-ray emission by spectral control using dual laser pulses
Author(s) -
Goki Arai,
Hiroyuki Hara,
Tadashi Hatano,
Takeo Ejima,
Weihua Jiang,
Hayato Ohashi,
Shinichi Namba,
A. Sunahara,
Akira Sasaki,
Masaharu Nishikino,
Gerry O'Sullivan,
Takeshi Higashiguchi
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.027748
Subject(s) - water window , optics , photon , laser , emissivity , materials science , absorption (acoustics) , pulse (music) , physics , radiation , detector
We demonstrate intense emission in the water-window soft x-ray spectral region by controlling the spectral behavior through changing the balance between emissivity and self-absorption in an expanding plasma. The number of photons obtained from a dual laser irradiated target with a 150-ps pre-pulse was maximized at 3.8 × 10 14 photons/sr in λ = 2.34 - 4.38 nm at a pulse separation time of 7 - 10 ns. Enhancement of the number of photons is attributed to efficient coupling with the main laser pulse while maintaining a tiny source size.