Measuring the angles and pyramidal error of high-precision prisms Z'W =\rl
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High-precision prisms, having maximum angle tolerances ?V.cOR`6
of 1 to 3 arcsec, find increasing application in optical metrology. ^4hO
Reported interferometric techniques for measuring O`\;e>!t
the wedge angles of such prisms achieve a precision of up tBWrL{xLe
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques \<>ih)J@tt
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric b<ZIWfs
methods have made use of goniometers,2 u8g~
spectrometers,3 master prisms,4,5 and collimators.6 However, JPUW6e07o
in the literature there are few reported methods for 2r4Uh1D~
measuring the pyramidal error, and the majority rely on }W8;= $jr
visual observation,2,7,8 by which it is only possible to measure )}(^,
Fo c
pyramidal errors to the order of 1 arcmin ~Ref. 8!. cn3\kT*
In the new arrangement presented here, one can measure 3m)0z{n
the prism angle and the pyramidal error separately or in gp?uHKsM
combination. This is possible because the measurements 6OIte -c
are made simultaneously but with different techniques.
