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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Research on Laser Cavity Ring-down Spectroscopy and Fiber-Based Measurement for SF6 Decomposed Gases
摘要： The four species gases including H2S, CO, HF and SO2 in the decomposition gas of SF6 were monitored online, according to the power industry requirements. The calibration technology and the algorithm, the optical path of cavity and signal to noise ratio of detection circuit are the key steps in the development of decomposed gas monitoring device. This paper first introduces the calibration method and technology of multi-component trace gas analysis instrument based on photo-acoustic spectroscopy. An on-line monitoring device for SF6 decomposition gas based on laser absorption spectroscopy is developed. The calibration algorithm is proposed and verified by experiment. Within the range of 0~200ppm, the stability is less than 2%. The concentration calibration method proposed in this paper can effectively monitor the concentration of H2S, CO, HF, SO2 typical characteristic gases, and provide theoretical technical guidance for SF6 gas insulated and high-voltage combined electrical apparatus.
关键词： cavity design,detection limit,SF6 decomposition gases,cavity ring-down spectroscopy
更新于2025-09-16 10:30:52
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Optimization of cavity designs of tapered AlInAs/InGaAs/InP quantum cascade lasers emitting at 4.5 μm
摘要： In this work design, fabrication and characterization of mid-infrared AlInAs/InGaAs/InP QCLs taper quantum cascade lasers are presented. In order to increase output power while keeping good beam quality, taper design of resonator was used. We have studied devices emitting at 4.5 μm with different shapes (linear, concave and convex) and angles of taper waveguide section, to optimize the output beam parameters, namely M2 and brightness. Experimental results demonstrate that convex geometry taper laser with 1.7o taper shows the best performance, the highest output power up to 5 W and the smallest horizontal beam divergence of 5.6o in the fundamental mode. This design is also characterized by the highest brightness.
关键词： quantum cascade lasers,cavity design,tapered laser
更新于2025-09-11 14:15:04