Element Selectivity in Second-Harmonic Generation of GaFeO3 by a Soft-X-Ray Free-Electron Laser

Sh Yamamoto, T. Omi, H. Akai, Y. Kubota, Y. Takahashi, Y. Suzuki, Y. Hirata, K. Yamamoto, R. Yukawa, K. Horiba, H. Yumoto, T. Koyama, H. Ohashi, S. Owada, K. Tono, M. Yabashi, E. Shigemasa, S. Yamamoto, M. Kotsugi, H. WadatiH. Kumigashira, T. Arima, S. Shin, I. Matsuda

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6 Citations (Scopus)

Abstract

Nonlinear optical frequency conversion has been challenged to move down to the extreme ultraviolet and x-ray region. However, the extremely low signals have allowed researchers to only perform transmission experiments of the gas phase or ultrathin films. Here, we report second harmonic generation (SHG) of the reflected beam of a soft x-ray free-electron laser from a solid, which is enhanced by the resonant effect. The observation revealed that the double resonance condition can be met by absorption edges for transition metal oxides in the soft x-ray range, and this suggests that the resonant SHG technique can be applicable to a wide range of materials. We discuss the possibility of element-selective SHG spectroscopy measurements in the soft x-ray range.

Original languageEnglish
Article number223902
JournalPhysical review letters
Volume120
Issue number22
DOIs
Publication statusPublished - 2018 Jun 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Yamamoto, S., Omi, T., Akai, H., Kubota, Y., Takahashi, Y., Suzuki, Y., Hirata, Y., Yamamoto, K., Yukawa, R., Horiba, K., Yumoto, H., Koyama, T., Ohashi, H., Owada, S., Tono, K., Yabashi, M., Shigemasa, E., Yamamoto, S., Kotsugi, M., ... Matsuda, I. (2018). Element Selectivity in Second-Harmonic Generation of GaFeO3 by a Soft-X-Ray Free-Electron Laser. Physical review letters, 120(22), [223902]. https://doi.org/10.1103/PhysRevLett.120.223902