Measuring the angles and pyramidal error of high-precision prisms d:h X3
DRRy5+,I
High-precision prisms, having maximum angle tolerances r90R~'5x9
of 1 to 3 arcsec, find increasing application in optical metrology. 9 vNz
yh\
Reported interferometric techniques for measuring }dEf |6_
the wedge angles of such prisms achieve a precision of up = d !YM6G
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques ko~e*31_E
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric {y<E_y
x1
methods have made use of goniometers,2 ~-A"M_n ?
spectrometers,3 master prisms,4,5 and collimators.6 However, T1RICIf 1F
in the literature there are few reported methods for l i%8X .
measuring the pyramidal error, and the majority rely on j$k/oQ
visual observation,2,7,8 by which it is only possible to measure F[X;A \
pyramidal errors to the order of 1 arcmin ~Ref. 8!. C1-Jj_XQ.
In the new arrangement presented here, one can measure `CG% Y>+
the prism angle and the pyramidal error separately or in zKf0 :X
combination. This is possible because the measurements (V`ddP-
are made simultaneously but with different techniques.
