Kazuyoshi Itoh | Osaka University (original) (raw)
Retired professor born in Himeji City, Japan.
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Papers by Kazuyoshi Itoh
2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEOPR), 2013
ABSTRACT We generate second-harmonic Er-fiber laser pulses with suppressed intensity noise by col... more ABSTRACT We generate second-harmonic Er-fiber laser pulses with suppressed intensity noise by collinear balanced detection technique, and Yb fiber laser pulses with a wide tunability (~250 cm-1) to demonstrate fiber-laser-based stimulated Raman microspectroscopy of polymer beads.
2008 Conference on Lasers and Electro-Optics, 2008
ABSTRACT
Cleo Qels 2010 Laser Science to Photonic Applications, 2010
ABSTRACT Long ring-cavity, all-polarization maintaining, Er-doped fiber laser using single wall c... more ABSTRACT Long ring-cavity, all-polarization maintaining, Er-doped fiber laser using single wall carbon nanotube polyimide film was demonstrated. Output pulses with pulse energy of 0.7∼2.6 nJ were obtained at ultra low repetition rate of 943∼154 kHz.
Review of Scientific Instruments, Sep 1, 1996
The first experiment of time-resolved spectral imaging of liquid in laser ablation is reported. A... more The first experiment of time-resolved spectral imaging of liquid in laser ablation is reported. An interferometric spectral imaging system dedicated to the measurements of the laser ablation is constructed. A pair of two-dimensional arrays of images are formed by a lenslet array coupled with a polarization interferometer and superposed on a detection plane. Each image in the array is provided with a varied path difference by the wedge-shaped liquid-crystal polarization interferometer to generate the interference signals. These interference signals include all the information necessary to reconstruct a spectral image and can be collected simultaneously. The mechanism of ablation of phenanthrene/ethanol solution was investigated by making use of the time-resolved spectral images of the laser induced plume. The results suggest that the photothermal processes are dominant in the ablation of the solution.
Applied Physics Express, May 25, 2011
Journal of the Optical Society of America B Optical Physics, 2010
Journal of Non Crystalline Solids, Oct 1, 2003
Ieice Transactions on Electronics, Feb 1, 2007
2006 European Conference on Optical Communications, 2006
Optics Letters, Jun 1, 1990
Technical Digest Cleo Pacific Rim 2001 4th Pacific Rim Conference on Lasers and Electro Optics, 2001
ABSTRACT The quenching of the ε phase of iron, which has not been observed under a conventional s... more ABSTRACT The quenching of the ε phase of iron, which has not been observed under a conventional shock compression, was attained using a femtosecond laser. The crystalline structure in a recovered iron sample was determined using an electron backscatter diffraction pattern, an electron diffraction pattern, and a synchrotron X-ray diffraction methods. A small quantity of the γ phase of iron also existed. Thermodynamic state inside the shock front has to be known because the shock induced phase transition occurs inside the shock front. Therefore, the temperature inside the shock front was calculated using thermodynamic equations. It was found that the ε phase was induced by the shock itself but not the γ phase. The γ phase was suggested to be induced as an intermediate structure between the α-ε transition. The femtosecond laser driven shock may have the potential to quench high-pressure phases which has not been attained using conventional methods.© (2004) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEOPR), 2013
ABSTRACT We generate second-harmonic Er-fiber laser pulses with suppressed intensity noise by col... more ABSTRACT We generate second-harmonic Er-fiber laser pulses with suppressed intensity noise by collinear balanced detection technique, and Yb fiber laser pulses with a wide tunability (~250 cm-1) to demonstrate fiber-laser-based stimulated Raman microspectroscopy of polymer beads.
2008 Conference on Lasers and Electro-Optics, 2008
ABSTRACT
Cleo Qels 2010 Laser Science to Photonic Applications, 2010
ABSTRACT Long ring-cavity, all-polarization maintaining, Er-doped fiber laser using single wall c... more ABSTRACT Long ring-cavity, all-polarization maintaining, Er-doped fiber laser using single wall carbon nanotube polyimide film was demonstrated. Output pulses with pulse energy of 0.7∼2.6 nJ were obtained at ultra low repetition rate of 943∼154 kHz.
Review of Scientific Instruments, Sep 1, 1996
The first experiment of time-resolved spectral imaging of liquid in laser ablation is reported. A... more The first experiment of time-resolved spectral imaging of liquid in laser ablation is reported. An interferometric spectral imaging system dedicated to the measurements of the laser ablation is constructed. A pair of two-dimensional arrays of images are formed by a lenslet array coupled with a polarization interferometer and superposed on a detection plane. Each image in the array is provided with a varied path difference by the wedge-shaped liquid-crystal polarization interferometer to generate the interference signals. These interference signals include all the information necessary to reconstruct a spectral image and can be collected simultaneously. The mechanism of ablation of phenanthrene/ethanol solution was investigated by making use of the time-resolved spectral images of the laser induced plume. The results suggest that the photothermal processes are dominant in the ablation of the solution.
Applied Physics Express, May 25, 2011
Journal of the Optical Society of America B Optical Physics, 2010
Journal of Non Crystalline Solids, Oct 1, 2003
Ieice Transactions on Electronics, Feb 1, 2007
2006 European Conference on Optical Communications, 2006
Optics Letters, Jun 1, 1990
Technical Digest Cleo Pacific Rim 2001 4th Pacific Rim Conference on Lasers and Electro Optics, 2001
ABSTRACT The quenching of the ε phase of iron, which has not been observed under a conventional s... more ABSTRACT The quenching of the ε phase of iron, which has not been observed under a conventional shock compression, was attained using a femtosecond laser. The crystalline structure in a recovered iron sample was determined using an electron backscatter diffraction pattern, an electron diffraction pattern, and a synchrotron X-ray diffraction methods. A small quantity of the γ phase of iron also existed. Thermodynamic state inside the shock front has to be known because the shock induced phase transition occurs inside the shock front. Therefore, the temperature inside the shock front was calculated using thermodynamic equations. It was found that the ε phase was induced by the shock itself but not the γ phase. The γ phase was suggested to be induced as an intermediate structure between the α-ε transition. The femtosecond laser driven shock may have the potential to quench high-pressure phases which has not been attained using conventional methods.© (2004) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.