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Proceedings Paper

Output beam polarisation of x-ray lasers with transient inversion
Author(s): K. A. Janulewicz; C. M. Kim; H. Stiel; T. Kawachi; M. Nishikino; N. Hasegawa
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Paper Abstract

We describe measurement results on the polarisation state of amplified spontaneous emission (ASE) signal from a collisionally pumped Ni-like Ag soft X-ray laser with a transient inversion. The result obtained with a calibrated membrane beam splitter as a polarisation state (P-state) selector shows that dominance one of the mutually perpendicular electric field components (p- or s-) in the output signal depends on the hydrodynamic state of the plasma medium. Hence, the output radiation has well defined polarisation state, even if this varies from shot to shot. Two different hydrodynamic state were referred as a ”low gain” and ”high gain” regimes and the allocated P-states had dominant s- and p-component, respectively. It was also shown that due to correlations between p- and s-components in the process of coherent amplification of noise, correct description of the polarisation state requires applying the generalised theory of polarisation and formulated there the generalised degree of polarisation (DOP). The critical role of active medium gain in the polarisation development is elucidated in a broader way.

Paper Details

Date Published: 22 September 2015
PDF: 7 pages
Proc. SPIE 9589, X-Ray Lasers and Coherent X-Ray Sources: Development and Applications XI, 95890N (22 September 2015); doi: 10.1117/12.2190178
Show Author Affiliations
K. A. Janulewicz, Gwangju Institute of Science and Technology (Korea, Republic of)
C. M. Kim, Gwangju Institute of Science and Technology (Korea, Republic of)
H. Stiel, Max Born Institute (Germany)
T. Kawachi, Japan Atomic Energy Agency (Japan)
M. Nishikino, Japan Atomic Energy Agency (Japan)
N. Hasegawa, Japan Atomic Energy Agency (Japan)


Published in SPIE Proceedings Vol. 9589:
X-Ray Lasers and Coherent X-Ray Sources: Development and Applications XI
Annie Klisnick; Carmen S. Menoni, Editor(s)

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