ZHU Xiang-bing, FU Shao-jun, YE Wei-quan, HE Shi-ping, CHEN Jin, XU Xiang-dong, HONG Yi-lin. Explanation of the round interference fringes in the measurement of varied-line-space gratings[J]. Editorial Office of Optics and Precision Engineering, 2002,(6): 634-638
ZHU Xiang-bing, FU Shao-jun, YE Wei-quan, HE Shi-ping, CHEN Jin, XU Xiang-dong, HONG Yi-lin. Explanation of the round interference fringes in the measurement of varied-line-space gratings[J]. Editorial Office of Optics and Precision Engineering, 2002,(6): 634-638DOI:
Varied-line-space gratings can correct aberrations
and they are useful in synchrotron radiation devices and laser inertial confinement fusion devices. In this paper
the line-density of varied-line-space gratings is measured with interferometry. The design of optical alignment is given
and the round interference fringes and their changes are observed in experiments. The prerequisite of round interference fringes is that the density of gratings is monotone
and the density of virtual grating divided by a integer is close to it
but the grooves are curved. The fringes that hyperbolas are predicted.
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references
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