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oe1(光电查) - 科学论文

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  • Incoherent Gain-Assisted Ring Enhanced Gas Absorption Spectroscopy

    摘要： A novel incoherent gain-assisted ring enhanced spectroscopy technique is presented overcoming the need for precise optical alignment and high reflectivity dielectric mirrors. A gain medium pumped below the lasing threshold is used to improve the ring finesse and, thus, the interaction length. Two configurations are considered and compared. The first configuration is dual coupler ring with the source outside the ring and the gain medium inside the ring, while the second configuration is single coupler resonator with the gain medium acting as the source. The configurations are studied analytically and experimentally for different system parameters. The experimental results are obtained for a coupling ratio of 90/10. The broadband source is the amplified spontaneous emission of a semiconductor optical amplifier (SOA), while another SOA is used as the gain medium. Acetylene (C2H2) gas absorption is measured around 1540 nm wavelength. The output spectrum of the ring is measured using a 70 pm resolution. The interaction length is found to be enhanced by a factor of 9.35 and 44 in case of the dual coupler and single coupler resonator, respectively, compared to the direct absorption of the gas cell.

    关键词： Gas spectroscopy,effective length enhancement,fiber sensors,finesse enhancement,incoherent broadband cavity enhanced absorption spectroscopy (IBBCEAS),active fiber cavities

    更新于2025-09-23 15:23:52

  • Review of Incoherent Broadband Cavity-Enhanced Absorption Spectroscopy (IBBCEAS) for Gas Sensing

    摘要： Incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) is of importance for gas detection in environmental monitoring. This review summarizes the unique properties, development and recent progress of the IBBCEAS technique. Principle of IBBCEAS for gas sensing is described, and the development of IBBCEAS from the perspective of system structure is elaborated, including light source, cavity and detection scheme. Performances of the reported IBBCEAS sensor system in laboratory and field measurements are reported. Potential applications of this technique are discussed.

    关键词： supercontinuum light source,incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS),gas sensing,broadband light source,molecular spectroscopy

    更新于2025-09-10 09:29:36