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Fluoride single crystals for UV/VUV nonlinear optical applications
Shimamura Kiyoshi,Villora Encarnacion G.,Muramatsu Kenichi,Kitamura Kenji,Ichinose Noboru The Korea Association of Crystal Growth 2006 한국결정성장학회지 Vol.16 No.4
The growth characteristics and properties of large size $SrAlF_5$ single crystals are described and compared with those of $BaMgF_4$. Transmission spectra in the vacuum ultraviolet wavelength region indicate a high transparency of $SrAlF_5$ (about 90% without considering surface reflection loses) down to 150 nm, on contrast to the optical loses observed for $BaMgF_4$. The ferroelectric character of $SrAlF_5$ is evidenced by the reversal of the spontaneous polarization in a hysteresis loop. The higher potential of $SrAlF_5$ in comparison with $BaMgF_4$ for the realization of all-solid-state lasers in the ultraviolet wavelength region by the quasi-phase matching (QPM) technique is pointed out. $SrAlF_5$, besides a higher grade of transparency, shows a nonlinear effective coefficient similar to that of quartz and uniaxial nature, on contrast to the one order smaller nonlinear coefficient and biaxial character of $BaMgF_4$. The refractive index of $SrAlF_5$ from the ultraviolet to the near-infrared wavelength region is measured by the minimum deviation method. The Sellmeier and Cauchy coefficients are obtained from the fits to the curves of the ordinary and extraordinary refractive indices, and the grating period for the first order QPM is estimated as a function of the wavelength. The poling periodicity for 193 nm SHG from 386 nm is $4{\mu}m$.
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서효진,김은식,장경혁,Liang Shi,Taiju Tsuboi,Kiyoshi Shimamura 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
The luminescence properties of Er3+ ions doped in a calcium niobium gallium garnet (Ca3(NbGa)2-xGa3O12; CNGG) crystal are investigated by using laser excitation spectroscopy. The time-resolved emission spectra of Er3+ in CNGG are measured, together with the luminescence decays caused by the 355- and 532-nm pulsed laser excitations. Different emission spectra are observed at different time delays of 250 ns and 5 μs, which suggest that presence of Er3+ ions in different environments is responsible for the observed results.
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Spectroscopic Properties of Er3+ Ions Doped in a Ca3(Nb2-x-zGaz)Ga3O12 Disordered Crystal
Eun Sik Kim,Hyo Jin Seo,장경혁,Liang Shi,Taiju Tsuboi,Kiyoshi Shimamura 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.2
Luminescence properties of Er³+ ions doped in a calcium niobium gallium garnet, Ca₃(Nb₂-x-z}Gaxz)Ga₃O12 (CNGG), disordered crystal are investigated by using optical absorption and emission spectroscopy. The energy levels of Er³+ in CNGG are identified by assignment of observed absorption and emission peaks in the spectral range of 300 -- 1600 nm. The broad emission band peaking at 470 nm and the broad excitation band peaking at 285 nm due to host sensitization are observed in both undoped and Er³+-doped CNGG crystals. The broad 470-nm emission band of Er³+-doped CNGG shows dips due to self-absorption by Er³+. The decays patterns of the ²H9/2, 4S3/2, 4F9/2 and 4I9/2 levels under excitation at 355 nm (corresponding to the ²G7/2 level) are revealed by multi-exponential decay curves which are due to decays of Er³+ in a crystal with disordered structure. The absorption and the emission spectra of the CNGG:Er³+ disordered crystal are compared with those of the YAlO₃:Er³+ ordered crystal. Luminescence properties of Er³+ ions doped in a calcium niobium gallium garnet, Ca₃(Nb₂-x-z}Gaxz)Ga₃O12 (CNGG), disordered crystal are investigated by using optical absorption and emission spectroscopy. The energy levels of Er³+ in CNGG are identified by assignment of observed absorption and emission peaks in the spectral range of 300 -- 1600 nm. The broad emission band peaking at 470 nm and the broad excitation band peaking at 285 nm due to host sensitization are observed in both undoped and Er³+-doped CNGG crystals. The broad 470-nm emission band of Er³+-doped CNGG shows dips due to self-absorption by Er³+. The decays patterns of the ²H9/2, 4S3/2, 4F9/2 and 4I9/2 levels under excitation at 355 nm (corresponding to the ²G7/2 level) are revealed by multi-exponential decay curves which are due to decays of Er³+ in a crystal with disordered structure. The absorption and the emission spectra of the CNGG:Er³+ disordered crystal are compared with those of the YAlO₃:Er³+ ordered crystal.
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