Measuring the angles and pyramidal error of high-precision prisms /j"sS2$U
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High-precision prisms, having maximum angle tolerances 1 ^g
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of 1 to 3 arcsec, find increasing application in optical metrology. QR">.k4QJ
Reported interferometric techniques for measuring b.O9 ITR
the wedge angles of such prisms achieve a precision of up IZ3{>N V
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques lZ&]|*>
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric &ff&Y.q~
methods have made use of goniometers,2 |xoF49
spectrometers,3 master prisms,4,5 and collimators.6 However, WS2os B c
in the literature there are few reported methods for 7B3w\
measuring the pyramidal error, and the majority rely on NA$zd(
visual observation,2,7,8 by which it is only possible to measure ,uz ]V1
pyramidal errors to the order of 1 arcmin ~Ref. 8!. }<jb vCeK
In the new arrangement presented here, one can measure NDO\B,7
the prism angle and the pyramidal error separately or in I =Wc&1g
combination. This is possible because the measurements OTB$V k
are made simultaneously but with different techniques.
