Self-Interference Patterns and Their Application to Target Characterization
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چکیده
The uniformity requirements of direct-drive targets are <tringent. The requirements on both sphericity and wall thickness uniformity are of the order of less than 1%. In the past, dualbeam interference microscopy has been used at LLE to characterize the wall thickness and uniformity of transparent targets.' With this technique, an interference pattern is formed between one beam that passes through the target and a second beam, split off from the first, that passes around the target. By comparison with computer-generated templates, these interference patterns can yield the wall thickness and its uniformity to a high dcgrce of a c c u r a ~ y . ~
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