A phase hologram not only has relief modulation but also has refractory index modulation, both modulation will affect the diffraction property of the phase hologram.
位相全息图一般既有浮雕调制又有折射率调制，它们都会对衍射特性产生影响。
A phase hologram not only has relief modulation but also has refractory index modulation, both modulation will affect the diffraction property of the phase hologram.
位相全息图一般既有浮雕调制又有折射率调制，它们都会对衍射特性产生影响。
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