Measuring the angles and pyramidal error of high-precision prisms G^=C#9c.m
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High-precision prisms, having maximum angle tolerances ;`MKi5g
of 1 to 3 arcsec, find increasing application in optical metrology. VOK0)O>&
Reported interferometric techniques for measuring =]yzy:~ey
the wedge angles of such prisms achieve a precision of up WTP~MJ#C
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques BK16~Wl
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric \gjY h2>
methods have made use of goniometers,2 @z1Yj"^Pm
spectrometers,3 master prisms,4,5 and collimators.6 However, )"Vd8*e
in the literature there are few reported methods for z&r@c-l@
measuring the pyramidal error, and the majority rely on iw ==q:$
visual observation,2,7,8 by which it is only possible to measure i[d@qp!H=
pyramidal errors to the order of 1 arcmin ~Ref. 8!. 9 EqU
2~
In the new arrangement presented here, one can measure MTxe5ob`$Q
the prism angle and the pyramidal error separately or in :CJ]^ v
combination. This is possible because the measurements 2PrUI;J$
are made simultaneously but with different techniques.
