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Simplified optical system for holographic subtraction

P Hariharan and B S Ramprasad

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Subtraction of one complex spatial function from another can be accomplished holographically by shifting the phase of the reference beam by pi between the two exposures. A simple and reliable system for this purpose, which makes use of the fact that the beam from a gas laser is usually plane-polarized, is described, and its application to obtain the equivalent of a dark field with the frozen-fringe technique in holographic interferometry is demonstrated.


PACS

42.40.Kw Holographic interferometry; other holographic techniques

07.60.Ly Interferometers

42.40.Eq Holographic optical elements; holographic gratings

42.40.Ht Hologram recording and readout methods

Subjects

Instrumentation and measurement

Optics, quantum optics and lasers

Dates

Issue 10 (October 1972)



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