Browse Prior Art Database

Length of Path Multiplication in Image-Forming Interferometers

IP.com Disclosure Number: IPCOM000118181D
Original Publication Date: 1996-Oct-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Wagner, D: AUTHOR

Abstract

Disclosed is a microinterferometer which uses length of path multiplication to enhance its resolution.

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Length of Path Multiplication in Image-Forming Interferometers

      Disclosed is a microinterferometer which uses length of path
multiplication to enhance its resolution.

      Special applications for the atomic force microscopy, lens
tests or for measuring latent images require interferometers with a
resolution of about 1 pm.  This may not be achieved with conventional
microinterferometers.

      Parallel beams focused by a lens all have the same optical path
but different geometrical paths.  The same applies for the light
paths when an object point is reproduced by a lens in an image point.
Fig. 1  shows two object points G1 and G2 which are reproduced in the
image points B1 and B2.  Point P1 represents the intersection of the
lens axis  with the axis of the object points and and of the image
points.

      For small delta b and delta g delta b/delta g is beta/2/ with
beta being the scale of reproduction.  That means that moving the
object point by delta x causes displacement of the image point  by
beta/2/ delta x.  This behavior is the basis for the length of path
multiplication in image-forming systems which leads to a resolution
increased by a factor of beta/2/.  The system in Fig. 2 contains a
differential interferometer and two additional lenses, ocular and
tubus lens, and a beam splitter in the aperture plane 2. The
recombination of the beams takes place in the aperture plane 2 after
the length of path multiplication.

      Beta sho...