OAS "Feodosya Instrument-Making Plant" Feodosya, Ukraine
In modern ellipsometers, the compensator
is often a plate of a uniaxial crystal with the optical axis lying in the
plate plane. The temperature variations of the ellipsometry data are due
to the large thickness of the compensator used. A double compensator is
proposed,consisting of two uniaxial crystal plates, with optical axes lying
in the plate plane and being mutually perpendicular. It is shown that using
as a compensator the uniaxial crystal plate with the optical axis making
a relatively small angle è with the plate normal, one can radically
change
the situation in ellipsometry by reducing essentially
experimental errors due to temperature variations.