Kenzo Nanri

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A Yb fiber laser pumped cw narrow-linewidth tunable mid-IR source based on a difference frequency generation (DFG) in a periodically poled LiNbO3 (PPLN) crystal for trace gas detection was demonstrated. A high power Yb fiber laser and a distributed feedback (DFB) laser diode were used as DFG pump sources. This source generated mid-IR at 3 microns with a(More)
We successfully demonstrated NO<sub>2</sub> detection based on differential absorption cavity ringdown spectroscopy using a dual wavelength passively locked external cavity diode laser. Selective trace NO<sub>2</sub> detection was achieved in a 2 ml compact ringdown cell.
This paper reports a laser diode pumped power build-up cavity (PBC) to apply for cavity ringdown spectroscopy (CRDS). The PBC is a compact-high finesse external cavity laser diode, which can obtain resonant enhancement without active cavity length control. PBC is applied generally undesired feed backed beam to cavity resonant enhancement. More than 2.30(More)
Optical multi-channel analyzers (OMA) are an indispensable tool for a spectroscopic measurement in ultraviolet and visible region. In spite of the requirement for various scientific and/or industrial fields, however, there has been no practical OMA in the mid-infrared region, because of the following reasons: (1) there has been no suitable multi-channel(More)
Two-tracer Laser Induced Fluorescence (LIF) technique with toluene and 3-pentanone is applied to visualize the assist gas flow in the laser cut kref. Assist gas distribution and oxygen concentration in the quartz model kerf is visualized.