A Dispersion Interferometer Based on a CO2 Laser |
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Authors: | A. L. Solomakhin P. A. Bagryanskii R. V. Voskoboinikov P. V. Zubarev A. N. Kvashnin A. A. Lizunov V. V. Maksimov A. D. Khil'chenko |
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Affiliation: | (1) Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;(2) Budker Institute of Nuclear Physics, Siberian Division, Russian Academy of Sciences, pr. Akad. Lavrent'eva 11, Novosibirsk, 630090, Russia |
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Abstract: | A double-pass dispersion interferometer based on a 9.6-µm CO2 laser with a sensitivity of 〈 n e l〉min ~ 1 × 1013 cm?2 and a temporal resolution of ~50 µ s, designed to measure linear plasma density, is described. A ZnGeP2 nonlinear crystal is used as the frequency doubler. The main advantages of the interferometer are its compactness and a low sensitivity to vibrations of optical elements. The interferometer requires no special vibration isolation. Its main components are arranged compactly on an optical bench outside the apparatus, except for a window for radiation injection and a retroreflector; these are mounted on the wall of the experimental facility's vacuum chamber. The advantages of the dispersion interferometer have been demonstrated in an experiment with a gas-dynamic trap. |
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