Abstract
In many interferometric optical systems, a controllable or variable phase delay between interfering beams is required.1 Conventionally, such a phase delay is generated by variation of the optical length difference between two paths in an interferometer. The resulting phase delay depends on wavelength, which is undesirable in many broadband interferometric schemes such as white-light interferometry. Pancharatnam proposed and demonstrated an alternative method of generating a (geometric) phase delay through the effect of an analyzer on two coherent light beams with different states of polarization.2
© 2001 Optical Society of America
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