排序方式: 共有31条查询结果,搜索用时 15 毫秒
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S. N. Tskhai Yu. B. Udalov P. J. M. Peters W. J. Witteman V. N. Ochkin 《Applied physics. B, Lasers and optics》1996,62(1):11-14
A radiofrequency excited atomic Xe slab laser with an active volume of 2 × 10 × 300 mm3 using a quartz envelope containing the laser-gas mixture shows a stable cw performance with an output power of almost 1 W. The free-running system oscillates, depending on gas composition and density, on several lines between 1.73 and 3.51 m. Line competition phenomena are observed. Single-line oscillation yields more than 500 mW. 相似文献
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D. A. Brazhnikov I. V. Nikolaev V. N. Ochkin M. V. Spiridonov S. N. Tskhai 《Laser Physics》2009,19(6):1323-1329
The trace atmospheric concentrations of NO2 are measured with the methods of the diode laser absorption spectroscopy and the phase shift of the modulated radiation. An electronic transition in a range of 415 nm is employed. For a measurement time of 20 ms, the sensitivity of the concentration measurements is about 10?11 relative to the concentration of air particles (0.02 ppbv). At a time interval of 5–10 min, the reproducibility of the absolute concentration measurements (0.1 ppbv) is limited by the low-frequency fluctuations of the optical parameters of the spectrometer and the calibration system and corresponds to the level determined by the Allan variance. 相似文献
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V.Yu. Kurochkin Yu.B. Udalov S.N. Tskhai F.J. Blok P.J.M. Peters W.J. Witteman V.N. Petrovskij E.D. Protsenko 《Applied physics. B, Lasers and optics》1997,65(1):37-40
Received: 28 August 1996/Revised version: 7 November 1996 相似文献
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V. N. Ochkin W. J. Witteman B. I. Ilukhin I. V. Kochetov P. J. M. Peters Yu. B. Udalov S. N. Tskhai S. N. Tskhai 《Applied physics. B, Lasers and optics》1996,63(6):575-583
An analysis is presented of the effect of the RF frequency on the active media of CO2 waveguide lasers. It is found that the characteristics are improved with increasing RF frequency because the space charge sheath width decreases with increasing excitation frequency. We also found that the sheath width decreases with the discharge current; this fact was never discussed before. The higher the exciting frequency the higher is the maximum input power of the discharge in the stable low current mode. It is attractive to extend the input power while keeping the discharge in this mode. Finally, a stabilizing excitation technique is described for the inherent unstable region of the discharge. 相似文献
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Ochkin V.N. Savinov S.Y. Tskhai S.N. Czarnetzki U. von der Gathen V.S. Dobele H.F. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1998,26(5):1502-1513
The application of various nonlinear optical laser spectroscopic techniques to plasma diagnostics are reported. The techniques discussed in this paper are two-photon laser induced fluorescence spectroscopy, double-resonant four-wave mixing, coherent anti-Stokes Raman-scattering (CARS), and a combination of emission spectroscopy and CARS. They are applied to measurements of atomic hydrogen densities, molecular temperature, chemical composition, electric field distributions, and vibrational population distribution. The basic principles are described and important aspects of the methods are discussed in context with application to various kinds of discharges at low and elevated pressures 相似文献