Publications by authors named "Kiyoshi Kato"

We revisit the 90° phase-matching conditions for second-harmonic, sum-frequency, and difference-frequency generation in thus far reported in the literature. We present refined Sellmeier equations coupled with an updated thermo-optic dispersion formula to correctly reproduce the experimental results for noncritical three-wave interactions obtained in the 0.565-10.

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We report experimental results on the temperature-dependent phase-matching properties of for second-harmonic generation and sum-frequency generation in the 0.7674-10.5910 µm range.

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Nonlinear vibrational spectroscopy profits from broadband sources emitting in the molecular fingerprint region. Yet, broadband lasers operating at wavelengths above 7 μm have been lacking, while traditional cascaded parametric frequency down-conversion schemes suffer from exceedingly low conversion efficiencies. Here we present efficient, direct frequency down-conversion of femtosecond 100-kHz, 1.

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This paper reports refined Sellmeier equations for the biaxial nonlinear crystal that provide a good reproduction of the phase-matching angles for second-harmonic generation (SHG) and sum-frequency generation (SFG) of the mid-IR outputs of Nd:YAG and Ho:YLF laser-pumped optical parametric oscillators (OPOs) and a frequency-doubled laser in the 0.7584-8.018 µm range.

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We present refined Sellmeier equations for that provide good reproduction of the phase-matching angles for frequency upconversion of laser radiation in the 1.7652-10.5910 µm range and for frequency downconversion in the 1.

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The unknown magnitude and relative signs of the trigonal crystal ${\rm BaGa}_{2}{\rm GeSe}_{6}$BaGaGeSe nonlinear coefficients have hindered defining an optimum orientation for maximum frequency conversion efficiency. This issue is resolved in the present work, obtaining ${d_{11}}= + {23.6}$d=+23.

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A thermo-optic dispersion formula for ${{\rm BaGa}_2}{{\rm GeSe}_6}$BaGaGeSe nonlinear crystal is reported. The experimentally determined temperature-dependent phase-matching conditions for second-harmonic and sum-frequency generation of Nd:YAG laser-pumped ${{\rm KTiOPO}_4}$KTiOPO (KTP) and ${{\rm RbTiOAsO}_4}$RbTiOAsO (RTA) optical parametric oscillators as well as a ${{\rm CO}_2}$CO laser and its harmonics in the 0.805-10.

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This paper reports on new experimental results on the temperature-dependent phase-matching properties of LiGaS for second-harmonic generation and sum-frequency generation in the 0.820-10.5910 μm spectral range.

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We present new experimental results for the phase-matching properties of the recently discovered BaGaGeSe crystal for harmonic generation of a Nd:YAG laser-pumped KTP OPO and a CO laser in the 0.778-10.5910 μm spectral range.

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This paper reports on the thermo-optic dispersion formula for BaGaSe that provides a good reproduction of the temperature-dependent phase-matching conditions for type-1 and type-2 second-harmonic generation of a Nd:YAG laser-pumped AgGaS optical parametric oscillator (OPO) and a CO laser in the 0.901-10.5910 μm spectral range, as well as the published data points for a Nd:YAG laser-pumped OPO at λ=3.

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This Letter reports on the new experimental results for second-harmonic generation and sum-frequency generation in LiGaS in the 1.025-10.5910 μm range, together with the new Sellmeier equations, which provide a good reproduction of the present experimental results, as well as the published data points for a Ti:AlO laser (λ=0.

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This paper reports on the new experimental results for second-harmonic generation and sum-frequency generation in LiGaSe in the 1.026-10.5910 μm range, and the improved Sellmeier equations that provide a good reproduction of the present experimental results, as well as the published data points for a Ti:AlO laser (λ=0.

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We report new experimental results on the phase-matching properties of a BaGaSe crystal for harmonic generation of a Nd:YAG laser-pumped AgGaS optical parametric oscillator (OPO) and a CO laser in the 0.901-10.5910 μm range.

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We report new experimental results on the phase-matching properties of yellow color HgGaS crystals for harmonic generation of an Nd:YAG laser-pumped KTiOPO (KTP) optical parametric oscillator (OPO) and CO lasers in the 0.944-10.5910 μm range.

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This paper reports on improved Sellmeier and thermo-optic dispersion formulas for LiInS, which provide an excellent reproduction of the temperature-dependent phase-matching conditions for second, sum-, and difference-frequency generation achieved in the 1.0642-10.5910 μm range.

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This paper reports the high-accuracy Sellmeier and thermo-optic dispersion formulas for the extraordinary ray of 5 mol. % MgO-doped congruent LiNbO(3) that provide excellent reproduction of the temperature-dependent quasi-phase-matching conditions in the 0.39-4.

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This paper reports a set of Sellmeier equations for GaS and GaSe that provide excellent reproduction of the phase-matching conditions for second- to sixth-harmonic generation of CO₂ laser radiation at 10.5910 μm in GaS(0.4)Se(0.

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This paper reports on the improved Sellmeier and thermo-optic dispersion formulas for LiInSe₂, which provide a good reproduction of the temperature-dependent phase-matching conditions for the nonlinear frequency-conversion experiments achieved in the 1.0642-10.5910 μm range.

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This paper reports high-accuracy Sellmeier and thermo-optic dispersion formulas for GaSe that provide excellent reproduction of the phase-matching conditions for second-, third-, and fourth- harmonic generation of CO2 laser radiation at 10.5910 μm in the 20°C-200°C range as well as the data points of Feng et al. [Opt.

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The Sellmeier equations for GaS and GaSe are constructed from the nonlinear experiments thus far reported in the literature. The model calculations based on these equations were found to reproduce well the phase-matching conditions for second-harmonic generation of the Er:YSGG laser at 2.7960 μm and the CO2 laser lines at 9.

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Primary squamous cell carcinoma (SCC) associated with ovarian endometriosis is extremely rare and has a poor prognosis due to insufficient information on the optimal postoperative treatment. Here, we describe the response of this tumor to the administration of paclitaxel-carboplatin. A 45-year-old woman diagnosed with stage IIIc primary SCC of the ovary associated with endometriosis underwent optimal surgery followed by six courses of chemotherapy at 3-week intervals with paclitaxel and carboplatin.

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Synthetic cationic lipids are promising transfection agents for gene therapy. We report here that polyamine conjugates of dialkyl phosphates, combined with natural lipids and assembled in the form of liposomes (polycationic liposome: PCL), possess high transfection activity in the COS-1 cell line. Furthermore, we describe the functional morphology of the PCL/DNA complexes as revealed by atomic force microscopy (AFM).

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BiB3O6 has been found to be simultaneously phase matchable for sum-frequency generation at 0.4627 and 0.6260 microm by mixing the outputs of a 0.

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Third-harmonic generation (THG) has been investigated in the monoclinic BiB(3)O(6). The symmetry and birefringence analysis revealed that there are phase-matching conditions for the direct third-order nonlinear process, where the cascading second-order processes are precluded by the zero effective nonlinearity. The first phase-matched pure chi((3)) THG in a noncentrosymmetric crystal is presented together with the improved Sellmeier and thermo-optic dispersion formulas.

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A solar-pumped 100 W class laser that features high efficiency and low cost owing to the use of a Fresnel lens and a chromium codoped neodymium YAG ceramic laser medium was developed. A laser output of about 80 W was achieved with combination of a 4 m(2) Fresnel lens and a pumping cavity as a secondary power concentrator. This output corresponds to 4.

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