| 摘要 |
In formulating a groove pattern for a diffraction grating by means of holography, unique groove patterns are obtained by use of astigmatic coherent beam as either one or two recording beams. Instead of use of only stigmatic beams, and astigmatism in recording light in manufacture of a halographic grating will bring more utilizable parameters in designing groove patterns by which new loci of the type of non-hyperboloidal curves are formed on grating substrates and thereby elimination of abberations which were conventionally difficult are achieved with various optical devices.
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