Measuring the angles and pyramidal error of high-precision prisms RYt6=R+f
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High-precision prisms, having maximum angle tolerances [ 6_"^jgH
of 1 to 3 arcsec, find increasing application in optical metrology. `Z:3` 7c
Reported interferometric techniques for measuring )i @1X H"D
the wedge angles of such prisms achieve a precision of up i!L;? `F{
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques J2'K?|,m
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric tR<L`?4
methods have made use of goniometers,2 L%f;J/
spectrometers,3 master prisms,4,5 and collimators.6 However, b7!UZu]IEv
in the literature there are few reported methods for m*gj|1k
measuring the pyramidal error, and the majority rely on r
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visual observation,2,7,8 by which it is only possible to measure xo(k?+P>.
pyramidal errors to the order of 1 arcmin ~Ref. 8!. < 9`?Z-lJP
In the new arrangement presented here, one can measure lcCJ?!lsSW
the prism angle and the pyramidal error separately or in ;|6FdU
combination. This is possible because the measurements SBX|Bcyk*
are made simultaneously but with different techniques.
