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Photonics Dictionary

rainbow hologram

Essentially, a hologram of a hologram, in which the first-generation hologram is masked with a narrow slit. During image reconstruction, the slit operates as the exit pupil in image space. The hologram's white-light exit pupil is spread out to form a spectrum by the grating's dispersions, so that specific wavelengths can be chosen by placing small exit pupils of the observing optics in the appropriate position of the spectrum.
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