The University of Osaka · Engineering
Professor Kana Fujioka's research lab specializes in experimental and theoretical studies of quantum materials, with a focus on strongly correlated electron systems and functional oxides. The lab investigates electronic structures and optical properties of complex oxides such as SrRuO₃ using advanced spectroscopic techniques like photoemission and x-ray absorption spectroscopy, combined with first-principles calculations. A key research direction involves understanding electron correlation effects in transition metal oxides and their impact on electronic and magnetic properties. Additionally, the lab explores optical materials, particularly deuterated KDP crystals, for applications in ultra-broadband nonlinear optics and laser frequency conversion.
Figures are computed from collected data and may differ slightly.
We have measured photoemission and oxygen $1s$ x-ray absorption spectra of the ferromagnetic metal ${\mathrm{SrRuO}}_{3}$ and compared them with a first-principles band-structure calculation. The overall distribution of Ru $4d$ and O $2p$ spectral weight is in good agreement with that predicted by the band-structure calculation. However, the observed spectral line shape of the Ru $4d$ band is spread over a wide energy range and the emission intensity at the Fermi level is weakened compared to th
The refractive index of a potassium dihydrogen phosphate (KDP) crystal strongly depends on the deuteration fraction of the crystal. The wavelength dependence of the phase-matching angle in the near-infrared optical parametric process shows convex and concave characteristics for pure KDP and pure deuterated KDP (DKDP), respectively, when pumped by the second harmonic of Nd- or Yb-doped solid state lasers. Using these characteristics, ultra-broadband phase matching can be realized by optimization
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