Measuring the angles and pyramidal error of high-precision prisms 1\hLwG6Jj
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High-precision prisms, having maximum angle tolerances
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of 1 to 3 arcsec, find increasing application in optical metrology. 4,RPidv%O
Reported interferometric techniques for measuring w[~G^x&
the wedge angles of such prisms achieve a precision of up p1N}2]e
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques x#{!hL
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have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric 9>RkFV
methods have made use of goniometers,2 +VwQ=[y]
spectrometers,3 master prisms,4,5 and collimators.6 However, y^2#;0W
in the literature there are few reported methods for z?/_b
measuring the pyramidal error, and the majority rely on ?Uql 30A
visual observation,2,7,8 by which it is only possible to measure Om3Ayk}
pyramidal errors to the order of 1 arcmin ~Ref. 8!. osC?2 .
In the new arrangement presented here, one can measure Z |$#
the prism angle and the pyramidal error separately or in &/@V$'G=
combination. This is possible because the measurements [ATJ!
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are made simultaneously but with different techniques.
