Measuring the angles and pyramidal error of high-precision prisms o&1ewE(O]
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High-precision prisms, having maximum angle tolerances nnX,_5s
of 1 to 3 arcsec, find increasing application in optical metrology. v2:A 4Pd:+
Reported interferometric techniques for measuring Tm5]M$)
the wedge angles of such prisms achieve a precision of up @.T
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to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques y]aV7
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have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric S,Boutd
methods have made use of goniometers,2 7jT]J
spectrometers,3 master prisms,4,5 and collimators.6 However, N;7Xt9l
in the literature there are few reported methods for zlZ $t{[,
measuring the pyramidal error, and the majority rely on Rz1&(_Ps
visual observation,2,7,8 by which it is only possible to measure wQ qI@
pyramidal errors to the order of 1 arcmin ~Ref. 8!. mOr>*uR
In the new arrangement presented here, one can measure
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the prism angle and the pyramidal error separately or in O emi }
combination. This is possible because the measurements Qx|m{1~-
are made simultaneously but with different techniques.
