Measuring the angles and pyramidal error of high-precision prisms 'MsxZqW"~
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High-precision prisms, having maximum angle tolerances nc l-VN
of 1 to 3 arcsec, find increasing application in optical metrology. i<&2Ffvq
Reported interferometric techniques for measuring ~":?})
the wedge angles of such prisms achieve a precision of up m:
w/[|_
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques }HXNhv-K
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric u^V`Ucd"R
methods have made use of goniometers,2 Y+WOU._46I
spectrometers,3 master prisms,4,5 and collimators.6 However, nc&V59*
in the literature there are few reported methods for zf2]|] *xz
measuring the pyramidal error, and the majority rely on (MbI8B>
visual observation,2,7,8 by which it is only possible to measure <PJwBA %{
pyramidal errors to the order of 1 arcmin ~Ref. 8!. &a-:ZA@
In the new arrangement presented here, one can measure HH[ ?LKd<
the prism angle and the pyramidal error separately or in 1 3
combination. This is possible because the measurements b/ur!2yr
are made simultaneously but with different techniques.
