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Title: Compact gain-saturated x-ray lasers down to 685 nm and amplification down to 585 nm

Plasma-based x-ray lasers allow single-shot nano-scale imaging and other experiments requiring a large number of photons per pulse to be conducted in compact facilities. However, compact repetitively fired gain-saturated x-ray lasers have been limited to wavelengths above λ = 8.85 nm. For this work, we extend their range to λ = 6.85 nm by transient traveling wave excitation of Ni-like Gd ions in a plasma created with an optimized pre-pulse followed by rapid heating with an intense sub-picosecond pump pulse. Isoelectronic scaling also produced strong lasing at 6.67 nm and 6.11 nm in Ni-like Tb and amplification at 6.41 nm and 5.85 nm in Ni-like Dy. This scaling to shorter wavelengths was obtained by progressively increasing the pump pulse grazing incidence angle to access increased plasma densities. We experimentally demonstrate that the optimum grazing incidence angle increases linearly with atomic number from 17 deg for Ζ = 42 (Mo) to 43 deg for Ζ = 66 (Dy). The results will enable applications of sub-7 nm lasers at compact facilities.
Authors:
 [1] ;  [2] ; ORCiD logo [2] ; ORCiD logo [3] ;  [2] ;  [4]
  1. Colorado State Univ., Fort Collins, CO (United States). Physics Dept.
  2. Colorado State Univ., Fort Collins, CO (United States). Electrical and Computer Engineering Dept.
  3. Colorado State Univ., Fort Collins, CO (United States). Electrical and Computer Engineering Dept.; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Colorado State Univ., Fort Collins, CO (United States). Physics Dept. and Electrical and Computer Engineering Dept.
Publication Date:
Grant/Contract Number:
AC05-00OR22725; FG02-04ER15592; ACI-1532235
Type:
Published Article
Journal Name:
Optica
Additional Journal Information:
Journal Volume: 5; Journal Issue: 3; Journal ID: ISSN 2334-2536
Publisher:
Optical Society of America
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1423179
Alternate Identifier(s):
OSTI ID: 1462828

Rockwood, Alex, Wang, Yong, Wang, Shoujun, Berrill, Mark, Shlyaptsev, Vyacheslav N., and Rocca, Jorge J.. Compact gain-saturated x-ray lasers down to 685 nm and amplification down to 585 nm. United States: N. p., Web. doi:10.1364/OPTICA.5.000257.
Rockwood, Alex, Wang, Yong, Wang, Shoujun, Berrill, Mark, Shlyaptsev, Vyacheslav N., & Rocca, Jorge J.. Compact gain-saturated x-ray lasers down to 685 nm and amplification down to 585 nm. United States. doi:10.1364/OPTICA.5.000257.
Rockwood, Alex, Wang, Yong, Wang, Shoujun, Berrill, Mark, Shlyaptsev, Vyacheslav N., and Rocca, Jorge J.. 2018. "Compact gain-saturated x-ray lasers down to 685 nm and amplification down to 585 nm". United States. doi:10.1364/OPTICA.5.000257.
@article{osti_1423179,
title = {Compact gain-saturated x-ray lasers down to 685 nm and amplification down to 585 nm},
author = {Rockwood, Alex and Wang, Yong and Wang, Shoujun and Berrill, Mark and Shlyaptsev, Vyacheslav N. and Rocca, Jorge J.},
abstractNote = {Plasma-based x-ray lasers allow single-shot nano-scale imaging and other experiments requiring a large number of photons per pulse to be conducted in compact facilities. However, compact repetitively fired gain-saturated x-ray lasers have been limited to wavelengths above λ = 8.85 nm. For this work, we extend their range to λ = 6.85 nm by transient traveling wave excitation of Ni-like Gd ions in a plasma created with an optimized pre-pulse followed by rapid heating with an intense sub-picosecond pump pulse. Isoelectronic scaling also produced strong lasing at 6.67 nm and 6.11 nm in Ni-like Tb and amplification at 6.41 nm and 5.85 nm in Ni-like Dy. This scaling to shorter wavelengths was obtained by progressively increasing the pump pulse grazing incidence angle to access increased plasma densities. We experimentally demonstrate that the optimum grazing incidence angle increases linearly with atomic number from 17 deg for Ζ = 42 (Mo) to 43 deg for Ζ = 66 (Dy). The results will enable applications of sub-7 nm lasers at compact facilities.},
doi = {10.1364/OPTICA.5.000257},
journal = {Optica},
number = 3,
volume = 5,
place = {United States},
year = {2018},
month = {3}
}