Measuring the angles and pyramidal error of high-precision prisms ` c'
Q54r?|'V
High-precision prisms, having maximum angle tolerances DikdC5>O>m
of 1 to 3 arcsec, find increasing application in optical metrology. `V&1]C8x
Reported interferometric techniques for measuring CZyz;Jtk
the wedge angles of such prisms achieve a precision of up . kc"E
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques P{S\pWZkk
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric 382*
methods have made use of goniometers,2 2$
|]Vj*Zs
spectrometers,3 master prisms,4,5 and collimators.6 However, j2 }
in the literature there are few reported methods for zJ ;>.0
measuring the pyramidal error, and the majority rely on V06CCy8n
visual observation,2,7,8 by which it is only possible to measure :xFu_%7
pyramidal errors to the order of 1 arcmin ~Ref. 8!. }!%JYG^!D
In the new arrangement presented here, one can measure S9 G+#[.|
the prism angle and the pyramidal error separately or in Tm)GC_
combination. This is possible because the measurements GIm
" )}W
are made simultaneously but with different techniques.
