Measuring the angles and pyramidal error of high-precision prisms dv -L!C
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High-precision prisms, having maximum angle tolerances 1AQVj]#S
of 1 to 3 arcsec, find increasing application in optical metrology. fI"sdzu^
Reported interferometric techniques for measuring O 7R IcU
the wedge angles of such prisms achieve a precision of up uNCM,J!#~
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques iGB1f*K%x
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric :dq.@:+<R
methods have made use of goniometers,2 L#O1 >
spectrometers,3 master prisms,4,5 and collimators.6 However, waI?X2
in the literature there are few reported methods for g%Bh-O9\
measuring the pyramidal error, and the majority rely on Wip@MGtJ
visual observation,2,7,8 by which it is only possible to measure ? lq
pyramidal errors to the order of 1 arcmin ~Ref. 8!. yJQ>u
In the new arrangement presented here, one can measure 2t 6m#
the prism angle and the pyramidal error separately or in ze2%#<
combination. This is possible because the measurements fh_+M"Y0`
are made simultaneously but with different techniques.
