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Let Ap be the difference between the phase shift a Helium-Neon laser beam expe- riences on traversing a given length of
vacuum and on traversing the same length of plasma. What is Ad when the laser beam passes through 10 cm of plasma
having a density of n = 102? m?? How could this be used as a density diagnostic? The wavelength of the He-Ne laser
radiation is 632.8 nm

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