194
3 Holographic Interferometry for Studying …
Fig. 3.2 Image of the contours of the relief of surface: a, b—of a cylinder, c—of a wedge; d,
e—of spheres, restored by a hologram, recorded in the oncoming beam. Reprinted from [94] with
permission
beams 1
and 2
directed into the hologram under the angles α 1 and α 2 . To eliminate
the image shift, the following condition should be met in different wavelengths
α 1
λ 1
=
α 2
λ 2
.
(3.9)
This condition is automatically fulfilled during hologram recording in colliding
beams. Phase difference for two wavelengths for the corresponding point of the object
is set by the expression
3 Holographic Interferometry for Studying …
Fig. 3.2 Image of the contours of the relief of surface: a, b—of a cylinder, c—of a wedge; d,
e—of spheres, restored by a hologram, recorded in the oncoming beam. Reprinted from [94] with
permission
beams 1
and 2
directed into the hologram under the angles α 1 and α 2 . To eliminate
the image shift, the following condition should be met in different wavelengths
α 1
λ 1
=
α 2
λ 2
.
(3.9)
This condition is automatically fulfilled during hologram recording in colliding
beams. Phase difference for two wavelengths for the corresponding point of the object
is set by the expression