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A 1.5 μΜ tunable CW single-frequency seed laser is injected into the methane-filled negative curvature hollow-core fiber, and then amplified by stimulated Raman scattering of methane molecule. The Stokes linewidth is measured at the output using a scanning Fabry-Perot interferometer. When the wavelength of the seed laser is tuned to the Stokes transition and the polarization direction of the seed...
Anti-resonant hollow-core fibers (AR-HCFs) have attracted intensive attention. In order to realize low-loss coupling between anti-resonant hollow-core fibers and solid-core fibers, tapered solid-core fibers are injected into the hollow-core of AR-HCFs. For the ice-cream type anti-resonant hollow-core fibers whose mode field diameter are about 35μm, the coupling efficiency is over 85% when the tapered...
Detection of trace chemicals sensitively and selectively is important for environmental, safety and industrial process monitoring. Based on erbium-doped photonic crystal fibre (ED-PCF) laser intra-cavity absorption spectroscopy detection technology, analyzing the infrared absorption spectrum of acetylene (C2H2) gas. The relationship between the gas concentration and the absorption of C2H2 at the normal...
Real-time and accurate detection of the flammable gas concentration is the key issue in spontaneous combustion prediction. A modified tunable diode laser absorption spectroscopy (TDLAS) technology has been used in this paper to achieve in-situ detection of trace Acetylene concentration. Noises and interference fringes are eliminated by wavelet adaptive threshold filtering, and then Kalman filtering...
Recent progress in development of broadly tunable Cr:ZnSe lasers for trace gas detection is reported. With an intracavity CaF2 prism, the CW Cr:ZnSe laser was tuned within a total wavelength range of 427 nm from 2164 nm to 2591 nm. And, the applied research about trace gas sensing based on Mid-IR broadly tunable Cr:ZnSe lasers has been discussed in this paper, which indicated that a single-frequency...
Based on Tunable Diode Laser Absorption Spectroscopy (TDLAS) and the feature of Vertical Cavity Surface Emitting Laser (VCSEL) which wavelength scanning range up to several nanometers, the methane sensor system was designed. To verify the characteristic of anti-cross interference, we made some spectroscopy stimulation and experiments to analyze the affects to the methane measurement results of the...
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