Measuring the angles and pyramidal error of high-precision prisms @= )_PG
'3eP<earRP
High-precision prisms, having maximum angle tolerances ( B$;'U<
of 1 to 3 arcsec, find increasing application in optical metrology. |r5 |IA
Reported interferometric techniques for measuring bU1UNm`{C
the wedge angles of such prisms achieve a precision of up 67 >* AL
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques )Rla VAtM
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric s]0x^"#B
methods have made use of goniometers,2 BuI&kU,WY
spectrometers,3 master prisms,4,5 and collimators.6 However, tsq]QTA*
in the literature there are few reported methods for b #|M-DmT
measuring the pyramidal error, and the majority rely on E ,5 j Y
visual observation,2,7,8 by which it is only possible to measure JI5?,
)-St
pyramidal errors to the order of 1 arcmin ~Ref. 8!. oQ@X}6B%S
In the new arrangement presented here, one can measure KcP86H52I
the prism angle and the pyramidal error separately or in YD$fN"}-
combination. This is possible because the measurements J\XYUs
are made simultaneously but with different techniques.
