Abstract
서로 다른 null optics를 사용하는 null test의 측정결과를 상호 비교함으로써 null CGH test 신뢰성을 알아보았다. 회전대칭 포물면경(90mm, F/0.76) 형상측정 및 측정장치 정렬용 null CGH를 설계, encoding, 제작 후 null CGH test를 실시하였다. 결과를 평면경을 null optics로 사용하는 autocollimation test측정치와 비교하여 null CGH test의 정확성을 평가하였다. Null tests using two different kinds of null corrector have been discussed. A parabolic mirror was used as a surface under test. After designing, encoding, and fabricating the CGH (computer generated hologram), the null CGH test was performed. An autocollimation test was also performed using a flat mirror. The reliability of the null CGH test has been discussed by comparing the result obtained by both null tests.
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