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Laser Plasma Soft X‐Ray Source in the Water Window Based on Cryogenic Targets
Author(s) -
AMANO SHO
Publication year - 2018
Publication title -
electronics and communications in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.131
H-Index - 13
eISSN - 1942-9541
pISSN - 1942-9533
DOI - 10.1002/ecj.12022
Subject(s) - water window , laser , plasma , cryostat , materials science , optics , synchrotron , microscope , analytical chemistry (journal) , optoelectronics , chemistry , physics , superconductivity , quantum mechanics , chromatography
SUMMARY To generate continuously repetitive soft X‐ray pulses in the water window from laser‐produced plasmas, a one‐dimensionally translating substrate system with a closed He gas cryostat that can continuously supply various cryogenic targets has been developed. The system was successfully operated at a lowest temperature of 15 K and at a maximum up‐down speed of 12 mm/s. Solid Ar and N 2 layers were formed, and the water‐window spectra from them were studied. The emission intensity from Ar was found to be about eight times stronger than that from N 2 . Developed laser‐plasma source demonstrated high average power of 140 mW in the water‐window soft X‐ray, when a commercial Nd:YAG Q‐switched laser was used to irradiate a solid Ar target with energy of 1 J at a repetition rate of 1 Hz. It can be used for various applications, including soft X‐ray microscopy, in place of synchrotron facilities.