Measuring the angles and pyramidal error of high-precision prisms rB<
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High-precision prisms, having maximum angle tolerances " 2o)1G
of 1 to 3 arcsec, find increasing application in optical metrology. wS hsu_(i
Reported interferometric techniques for measuring /!P,o}l7
the wedge angles of such prisms achieve a precision of up i%:oO
KI
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques N0vr>e`
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric ?qO_t;:0>
methods have made use of goniometers,2 D0.7an6
spectrometers,3 master prisms,4,5 and collimators.6 However, 8I$>e (
in the literature there are few reported methods for &?#V*-;^
measuring the pyramidal error, and the majority rely on ?WKFDL'_0j
visual observation,2,7,8 by which it is only possible to measure l> W?XH
pyramidal errors to the order of 1 arcmin ~Ref. 8!. 6H53FMqr
In the new arrangement presented here, one can measure +A>>Ak|s
the prism angle and the pyramidal error separately or in "fU=W|lY
combination. This is possible because the measurements 3ktjMVy\
are made simultaneously but with different techniques.
