Measuring the angles and pyramidal error of high-precision prisms ?i.]|#{Z
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High-precision prisms, having maximum angle tolerances z 0;+.E!
of 1 to 3 arcsec, find increasing application in optical metrology. MZt~
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Reported interferometric techniques for measuring a@&^t( 1
the wedge angles of such prisms achieve a precision of up rYnjQr2a
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques K-$gTV
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric OzFA>FK0f;
methods have made use of goniometers,2 ~E2xIhV
spectrometers,3 master prisms,4,5 and collimators.6 However, )V!dmVQq{g
in the literature there are few reported methods for (
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measuring the pyramidal error, and the majority rely on O
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visual observation,2,7,8 by which it is only possible to measure
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pyramidal errors to the order of 1 arcmin ~Ref. 8!. P:z 5/??2S
In the new arrangement presented here, one can measure EUvxil
the prism angle and the pyramidal error separately or in b|i94y(
combination. This is possible because the measurements * \@u,[,
are made simultaneously but with different techniques.