Precise Measurement of Saturated Absorption Spectral Width of Methane : Atoms and Molecules

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概要

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• In order to measure the saturated absorption width of methane, a high-resolution laser spectrometer was developed by means of a phaselock technique. The accuracy of the offset frequency and the frequency fluctuation was estimated to be about 22Hz and 35τ^<-1>Hz, respectively. In addition, an integral and proportional-derivative(I-PD) control method was applied to the frequency scanning laser system and its response time was improved in comparison with an integral proportional(IP) control method. The saturated absorption spectral broadening was measured as a function of laser out put power P in μW and methane pressure p in mTorr. The spectral width of the saturated absorption of methane was expressed by Γ(p,P)=150.36+15.60・p+1.625・p[kHz]. Furthermore, its residual spectral width was analyzed for the geometrical and transit time broadening, and the saturation broadening and wave front effect were also discussed.

• 社団法人応用物理学会の論文
• 1988-09-20

著者

• Akimoto Yoshiaki

  National Research Laboratory Of Metrology

関連論文

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• Frequency Locking of 543 nm He-Ne Laser on Iodine Spectrum
• Performance of Methane-Stabilized Lasers with the Method of Saturated Absorption
• Frequency Fluctuation Analysis of CH_4 Stabilized He-Ne Lasers
• Profile Measurements of Methane Saturated Absorption Using a Methane-Stabilized Laser Spectrometer
• Precise Measurement of Saturated Absorption Spectral Width of Methane : Atoms and Molecules

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