Measuring the angles and pyramidal error of high-precision prisms -n
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High-precision prisms, having maximum angle tolerances 9i<-\w^$
of 1 to 3 arcsec, find increasing application in optical metrology. KYu(H[a
Reported interferometric techniques for measuring n2{{S(N
the wedge angles of such prisms achieve a precision of up N
&[,nUd
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques 1 (i>Vt.+
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric Vrj1$NL%
methods have made use of goniometers,2 AMd)d^;
spectrometers,3 master prisms,4,5 and collimators.6 However, `zp2;]W
in the literature there are few reported methods for NN 6KLbC(
measuring the pyramidal error, and the majority rely on E.`d k.
visual observation,2,7,8 by which it is only possible to measure $uw+^(ut
pyramidal errors to the order of 1 arcmin ~Ref. 8!. =]QH78\3
In the new arrangement presented here, one can measure kN j3!u$
the prism angle and the pyramidal error separately or in <gdgcvd
combination. This is possible because the measurements k<| l \]w
are made simultaneously but with different techniques.
