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Journals and Conferences
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)
We report on a novel, very simple mode selective annular beam generator with a laser diode pumped power build-up cavity and cylindrical lens based mode converter. The system can readily be available for optical tweezers.
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)
Instantaneous measurement of NH/sub 3/ and NO/sub x/ both in near-infrared (near-IR) and mid-infrared (mid-IR) region provided by single difference frequency generation device is demonstrated.
A new type multi-pass cell was demonstrated for absorption spectroscopy. This cell is useful when performing gas measurement. Moreover, the optical characteristic of a cell was verified.
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.
A power build-up cavity (PBC) system is very convenient and reasonable technique to achieve very high intracavity optical power. It is studied for laser gas sensor applications. This paper describes the stability of the PBC.
Intelligent gas detection to monitor Hydrogen concentration based on stokes Raman scattering was demonstrated. Power Build-up Cavity (PBC) as a light source, Avalanche Photo Diode (APD) was employed. The detection limit was lower than 200ppm.