Measuring the angles and pyramidal error of high-precision prisms "6N~2q,SW
3z )"U
High-precision prisms, having maximum angle tolerances LuP?$~z
of 1 to 3 arcsec, find increasing application in optical metrology. - ~\. n
Reported interferometric techniques for measuring jD/7 /G*
the wedge angles of such prisms achieve a precision of up Q"|kW[Sg
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques n2d8;B#
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric {(Og/[
methods have made use of goniometers,2 qX{X4b$
spectrometers,3 master prisms,4,5 and collimators.6 However, TcD [Teu
in the literature there are few reported methods for 1Vf78n
measuring the pyramidal error, and the majority rely on a1G9wC:e
visual observation,2,7,8 by which it is only possible to measure nFe` <Al$N
pyramidal errors to the order of 1 arcmin ~Ref. 8!. E-sSRt
In the new arrangement presented here, one can measure jefNiEE[
the prism angle and the pyramidal error separately or in gf3U#L}P
combination. This is possible because the measurements /&$"}Z6z
are made simultaneously but with different techniques.
