The invention provides for the making of <200 nm wavelength fluoride
crystal optical elements from selected fluoride single crystals of
determined quality.
The invention relates to a method of determining the optical quality of a
fluoride single crystal.
The method according to the invention is characterised in that it comprises
the following steps:
(a) irradiating at least one volume element of the fluoride single crystal,
along at least one given family of crystalline planes with a hard X-ray
beam, in order to obtain a picture of the diffraction in transmission mode
of the hard X-rays across this at least one volume element along this at
least one family of crystalline planes,
(b) studying the picture obtained in step (a), and
(c) calculating the mosaicity of the at least one volume element along the
at least one family of crystalline planes, from the study of step (b).
The invention finds application in the field of the optical industry.
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