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Fig.1.
Surface diagnostic system supplied to the International
Laser Center at Bratislava (Slovak Republic).
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As a result of this Project fulfillment, a non-contact
sensor for reconstructing the shape of partially
reflective surfaces and analyzing phase inhomogeneities
has been developed. The sensor uses the Shack-Hartman
method implying that a lenslet array focuses onto a CCD
array a laser beam reflected from the surface under study
or passed through an optically inhomogeneous medium. The
location of each focal spot produced depends on the local
slope of the wavefront of the beam passing through the
input aperture of the sensor. The local slope matrix is
transformed into a set of coefficients for Zernike
polynomials
[see
Zernike Polynomials] that fully represent low-order aberrations of the
wavefront under study (up to 12-th order). Thus, the
sensor is capable of quantitatively reconstructing the
shape of a reflective surface or an optical thickness
distribution across an inhomogeneous medium. The
transverse resolution is determined by the number of
lenslets the array contains.
The Project was funded by the
Government of the
Russian
Federation
in the
framework of Agreement 01-01-06/26-629 "On financing
the development and implementation of projects aimed at
supplying
International
Laser
Center
in
Bratislava
with
unique laser equipment".
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;)