Optical-fiber sensor based on the second-harmonic emission of a near-infrared semiconductor laser as light source |
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Authors: | Takashi Okazaki Totaro Imasaka Nobuhiko Ishibashi |
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Institution: | Faculty of Engineering, Kyushu University, Hakozaki, Fukuoka 812 Japan |
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Abstract: | Second-harmonic emission from a near-infrared semiconductor laser is used as the light source for fluorimetry. The efficiency of the second-harmonic generation is 2.5×10?6; at 390 nm, the power achieved is 50 nW when a 20-mW semiconductor laser (780 nm) is used. For fluorimetric determination of 7-diethylamino-4-methylcoumarin, the calibration plot is linear in the range 0–8×10?7 M, the detection limit being 5×10-∞ M (S/N=3 ). The generated ultraviolet emission is used with benzo (ghi)perylene in an optical-fiber sensor for oxygen (0–15%). |
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