Measuring the angles and pyramidal error of high-precision prisms I(9R~q
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High-precision prisms, having maximum angle tolerances H6&J; yT}
of 1 to 3 arcsec, find increasing application in optical metrology. :OW ;?{ ~j
Reported interferometric techniques for measuring #'q<v"w
the wedge angles of such prisms achieve a precision of up XXh6 ^@H=
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques /__PSK
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric P1NJ^rX
methods have made use of goniometers,2 hAm`NJMSO
spectrometers,3 master prisms,4,5 and collimators.6 However, 1y lk4@`
in the literature there are few reported methods for a\%xB >LX
measuring the pyramidal error, and the majority rely on IXb}AxB f
visual observation,2,7,8 by which it is only possible to measure @fa@s-wb
pyramidal errors to the order of 1 arcmin ~Ref. 8!. 8Th` ]tI
In the new arrangement presented here, one can measure !H 2QjW
the prism angle and the pyramidal error separately or in {O+Kw<d
combination. This is possible because the measurements y2+p1
are made simultaneously but with different techniques.
