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• W2183843776 abstract "The He-Ne/CH4 laser frequency standard using recoil doublet components as a reference was under investigation. The frequency shifts for different parameters were measured. These experiments allow us to estimate the reproducibility of the methane standard of Summary Narrow resonances with quality of 10’2-1013 were achieved in laser spectroscopy [l-31. This fact gives us hope that it is possible to create optical frequency standards with better metrological parameters than those of the Cs-standard. To do this, however, it is necessary to investigate the influence of various factors on the position of optical resonances. We have investigated the He-Ne/CH4 frequency standard at 3.39 pm. The recoil doublet components on the 6-7 transition F2(’)P(7)v3 methane line have been used as a reference. Two similar He-Ne lasers with intracavity telescopic light beam expanders were used in our experiments. The length and diameter of the absorbing cells were 8,5 m and 0.5 m, respectively. The absorbing gas was protected by Permalloy jacket that decreased the magnitude of the Earth magnetic field inside the methane cells approximately by a factor of 10. The possibility of using each of two recoil doublet components, separately and in combination, has been investigated. Theoretical and experimental investigations of the frequency shifts of the recoil doublet components have been carried out for the different parameters, such as pressure, temperature, cross-section of the light beam, laser power, frequency modulation, magnetic field, and disalignment of the laser cavity. Uncontrolled variations in such factors as temperature, light beam cross-section, laser power, frequency modulation, and magnetic field do not limit the reproducibility of 10‘15. The main problem is determined by the shifts due to the methane pressure in the absorbing cell. These shifts are connected with the second-order Doppler effect and mutual influence of the neighboring wings of the recoil doublet components. At the same time, it has been found that the position of the high-frequency component at pressure of 30-90 pTorr shifts in the frequency range of about k3 Hz. When using the average mean of the two components, the pressure of 80 pTorr is most suitable. This pressure may be tested additionally by the measurement of the frequency interval between the recoil doublet components. In this case the frequency reproducibility is at the level of It 2 Hz there in our experiments. The experimental results are in agreement with the calculations that take into account the influence of the quadratic Doppler effect, the recoil effect, the secondorder saturation, and modulation. Our investigations have shown that the frequency reproducibility of the standard based on the laser created is of the order of 1 O-I4." @default.
• W2183843776 created "2016-06-24" @default.
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• W2183843776 date "1999-01-01" @default.
• W2183843776 modified "2023-09-24" @default.
• W2183843776 title "METHANE OPTICAL FREQUENCY STANDARD ON RECOIL DOUBLET COMPONENTS" @default.
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