Measuring the angles and pyramidal error of high-precision prisms Na$Is'F &p
CqHK %M
High-precision prisms, having maximum angle tolerances g8Q5m=O*
of 1 to 3 arcsec, find increasing application in optical metrology. @+'-ADX
Reported interferometric techniques for measuring IP`` O!WP
the wedge angles of such prisms achieve a precision of up O=v#{ [
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques |u0( t,T
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric [01.\eh
methods have made use of goniometers,2 y;t6sM@
spectrometers,3 master prisms,4,5 and collimators.6 However, *.~ 6S3}
in the literature there are few reported methods for BYO"u6
measuring the pyramidal error, and the majority rely on AX? fuDLs
visual observation,2,7,8 by which it is only possible to measure 1BAgtd$3
pyramidal errors to the order of 1 arcmin ~Ref. 8!. e%4:)
IV!;
In the new arrangement presented here, one can measure *+TH #EL2
the prism angle and the pyramidal error separately or in zG' "9kJx
combination. This is possible because the measurements }"|"Q7H
are made simultaneously but with different techniques.
