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Title: Observation of Reverse Saturable Absorption of an X-ray Laser

Journal Article · · Physical Review Letters
 [1];  [1];  [1];  [2];  [3];  [3];  [4];  [4];  [5];  [6];  [4];  [6];  [4];  [6];  [7];  [1];  [5];  [8];  [6];  [5] more »;  [5];  [9];  [6] « less
  1. Inst. of Basic Science, Gwangju (Korea, Republic of); Gwangju Inst. of Science and Technology (Korea, Republic of)
  2. Intl Atomic Energy Agency (IAEA), Vienna (Austria)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Academy of Sciences of the Czech Republic (ASCR), Prague (Czech Republic). Inst. of Physics
  5. Univ. of Oxford (United Kingdom)
  6. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  7. Univ. of California, Berkeley, CA (United States)
  8. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  9. European X-ray Free-Electron Laser (XFEL), Schenefeld (Germany)

A nonlinear absorber in which the excited state absorption is larger than the ground state can undergo a process called reverse saturable absorption. It is a well-known phenomenon in laser physics in the optical regime, but is more difficult to generate in the x-ray regime, where fast nonradiative core electron transitions typically dominate the population kinetics during light matter interactions. Here, we report the first observation of decreasing x-ray transmission in a solid target pumped by intense x-ray free electron laser pulses. The measurement has been made below the K-absorption edge of aluminum, and the x-ray intensity ranges are 1016 –1017 W=cm2. It has been confirmed by collisional radiative population kinetic calculations, underscoring the fast spectral modulation of the x-ray pulses and charge states relevant to the absorption and transmission of x-ray photons. The processes shown through detailed simulations are consistent with reverse saturable absorption, which would be the first observation of this phenomena in the x-ray regime. These light matter interactions provide a unique opportunity to investigate optical transport properties in the extreme state of matters, as well as affording the potential to regulate ultrafast x-ray freeelectron laser pulses.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
IBS-R012-D1; NRF-2016R1A2B4009631; NRF-2015R1A5A1009962; EP/H035877/1; EP/L000849/1; AC02-76SF00515
OSTI ID:
1390622
Alternate ID(s):
OSTI ID: 1375496
Journal Information:
Physical Review Letters, Vol. 119, Issue 7; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

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Cited By (1)

Observations of non-linear plasmon damping in dense plasmas journal May 2018

Figures / Tables (3)