Measuring the angles and pyramidal error of high-precision prisms !P#lTyz
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High-precision prisms, having maximum angle tolerances ld`oIEj!P_
of 1 to 3 arcsec, find increasing application in optical metrology. 42
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Reported interferometric techniques for measuring a&4>xZU #
the wedge angles of such prisms achieve a precision of up jb fMTb4
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques naM4X @jl
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric kLADd"C
methods have made use of goniometers,2 L 'H1\'
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spectrometers,3 master prisms,4,5 and collimators.6 However, ~ia#=|1}
in the literature there are few reported methods for <86upS6
measuring the pyramidal error, and the majority rely on 0M-Zp[w\-
visual observation,2,7,8 by which it is only possible to measure (F~eknJ
pyramidal errors to the order of 1 arcmin ~Ref. 8!. z2S53^C*
In the new arrangement presented here, one can measure ^MDBJ0
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the prism angle and the pyramidal error separately or in OZ$u&>916
combination. This is possible because the measurements ]%F3 xzOk
are made simultaneously but with different techniques.
