Output beam polarisation of x-ray lasers with transient inversion

K. A. Janulewicz; C. M. Kim; H. Stiel; T. Kawachi; M. Nishikino; N. Hasegawa

doi:10.1117/12.2190178

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22 September 2015 Output beam polarisation of x-ray lasers with transient inversion

K. A. Janulewicz, C. M. Kim, H. Stiel, T. Kawachi, M. Nishikino, N. Hasegawa

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Proceedings Volume 9589, X-Ray Lasers and Coherent X-Ray Sources: Development and Applications XI; 95890N (2015) https://doi.org/10.1117/12.2190178
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

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.

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K. A. Janulewicz, C. M. Kim, H. Stiel, T. Kawachi, M. Nishikino, and N. Hasegawa "Output beam polarisation of x-ray lasers with transient inversion", Proc. SPIE 9589, X-Ray Lasers and Coherent X-Ray Sources: Development and Applications XI, 95890N (22 September 2015); https://doi.org/10.1117/12.2190178

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