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作者:Hidetsugu Yoshida
来源:[J].Geomorphology(IF 2.552), 2014, Vol.223, pp.67-80
摘要:Abstract(#br)This paper investigates the relationship of hummock orientation to the flow dynamics of volcanic debris avalanches. There are opposing views on whether hummocks are systematically aligned along debris avalanche paths, or not. To investigate this geomorphological...
作者:Hidetsugu Yoshida , Toshihiko Sugai , Hiroo Ohmori
来源:[J].Geomorphology(IF 2.552), 2011, Vol.136 (1), pp.76-87
摘要:Abstract(#br)Catastrophic collapse of volcanic edifices and the accompanying rockslide-debris avalanches drastically change landforms and cause disasters around volcanoes. Rapid modification of the landforms created by these events makes it difficult to estimate the magnitud...
作者:Hidetsugu Yoshida , Toshihiko Sugai
来源:[J].Geomorphology(IF 2.552), 2006, Vol.86 (1), pp.61-72
摘要:Abstract(#br)A rapid, large-scale sediment transport event due to a catastrophic landslide plays an important role in changing drainage basin topography. However, volumetric evaluation of such events that occurred before the Holocene has been limited. This study quantitative...
作者:Hidetsugu Yoshida , Hisanori Fujita ...
来源:[J].Optics Communications(IF 1.438), 2003, Vol.222 (1), pp.257-267
摘要:Abstract(#br)Fused-quartz glass is found to be an ideal medium for high-power stimulated Brillouin-scattering experiments, because it gives a high reflectivity of over 95% at an incident energy of 2.3 J, has pulse duration of 16 ns, and has excellent fidelity in phase conjugation...
作者:Hidetsugu Yoshida , Hisanori Fujita
来源:[J].Optics Communications(IF 1.438), 2006, Vol.266 (1), pp.274-279
摘要:Abstract(#br)A liquid-cooled ceramic Nd:YAG split-disk laser amplifier has been designed for a high-average-power laser system. The maximum average output power of 17.1 W (1.71 J at 10 Hz) and the beam size of far-field pattern with 1.5 times diffraction limit was obtained. The c...
作者:Hidetsugu Yoshida , Hisanori Fujita
来源:[J].Optics Communications(IF 1.438), 2006, Vol.260 (1), pp.277-281
摘要:Abstract(#br)A prototype split-disk amplifier consisted of four Nd:YAG ceramics and single crystals was demonstrated with a 3.7 cm square clear aperture. A single-pass small-signal gain of 2.0 and a total stored energy of 11.1 J in the eight YAG disks were obtained. The maxi...
作者:Hidetsugu Yoshida , Takayoshi Norimatsu ...
来源:[J].Applied Surface Science(IF 2.112), 2002, Vol.197, pp.808-813
摘要:Abstract(#br)A uniform laser ablation was observed in a polystyrene film coated with a photovoltaic perylene/phthalocyanine bilayer when an incident took place at an intensity range of 10 9 –10 10 W/cm 2 ( λ =1064 nm, 1.1 ns FWHM). Without the bilayer coating, the laser pul...
作者:Hidetsugu Yoshida , Koji Tsubakimoto ...
来源:[J].Optics Communications(IF 1.438), 2008, Vol.281 (14), pp.3902-3905
摘要:Abstract(#br)We have demonstrated an efficient high energy 2 μm laser generation with a 36 mm long large aperture 5 mol% MgO-doped periodically poled LiNbO 3 (PPMgLN) nonlinear optical crystal. A high power Q-switched Nd:YAG laser (1.064 μm) was used to pump the quasi-phase ...
作者:Hidetsugu Yoshida , Hisanori Fujita
来源:[J].Fusion Engineering and Design(IF 0.842), 1999, Vol.44 (1), pp.427-430
摘要:Abstract(#br)Arbitrary temporal waveform control can be achieved by means of amplifier gain control with chirped laser pulse. As lasers for fusion research are broad-band glass lasers, a chirping method of the THz region is required to obtain arbitrary temporal waveform control. ...

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