Measuring the angles and pyramidal error of high-precision prisms X )6}<A
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High-precision prisms, having maximum angle tolerances nz_=]PH O&
of 1 to 3 arcsec, find increasing application in optical metrology. D#"BY;
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Reported interferometric techniques for measuring l}w9c`f
the wedge angles of such prisms achieve a precision of up V}=%/OY?
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques f+3ico]f@
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric dRC
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methods have made use of goniometers,2 LelCjC{`1
spectrometers,3 master prisms,4,5 and collimators.6 However, n/] w!
in the literature there are few reported methods for wwmHr!b :6
measuring the pyramidal error, and the majority rely on 3%HF" $Gg
visual observation,2,7,8 by which it is only possible to measure bzj9U>eY
pyramidal errors to the order of 1 arcmin ~Ref. 8!. 8d4:8}
In the new arrangement presented here, one can measure j<,Ho4v}_
the prism angle and the pyramidal error separately or in {9mXJu$cc
combination. This is possible because the measurements xbUL./uj
are made simultaneously but with different techniques.
