Optoelectronic modulation of a laser interferometer in the infrared for accurate electron density variation measurements |
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| Authors: | Lesage A Richou J Charil P Combier M Lebrun J L |
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| Affiliation: | D.E.P.E.G. Observatoire de Meudon, 92190 Meudon, France. |
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| Abstract: | An improved method for high-electron-density (10(17) cm(-3)) measurement in a shock-generated plasma is described. A laser interferometer operated at 3.39 mum is regularly modulated (1 MHz) by a LiNbO(3) electro-optical crystal. Thus electron-density variations of 8x10(15) cm(-3) mus(-1) and fluctuation of 8x10(14) cm(-3) can be simultaneously and accurately measured in a 4x4-cm conventional shock tube. Experimental results in reflected shock waves are presented. |
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