Measurement of laser fusion capsules using the interferometer method of excess fractions

Abstract

A system is proposed to allow use of the method of excess fractions with a high-power interference nicroscope. This allows the measurement of average wall thicknesses for small «200-/jm o.d.. and from 0.5-to 2.0-nm wall thicknesses) transparent laser fusion targets to better than 0.5% and wall uniformity to better than 0.3%. The DT gas fill of the capsules can be nondestructively measured to about ±3%.