Measuring the angles and pyramidal error of high-precision prisms MCO$>QL
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High-precision prisms, having maximum angle tolerances D;;o
of 1 to 3 arcsec, find increasing application in optical metrology. )LS+M _
Reported interferometric techniques for measuring T_|fb)G+{
the wedge angles of such prisms achieve a precision of up oqU#I~ -
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques uq1(yyWp(
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric ]oZ,{Q5~
methods have made use of goniometers,2 W$ d{
spectrometers,3 master prisms,4,5 and collimators.6 However, g he=mQ-
in the literature there are few reported methods for "8Wc\ YDh
measuring the pyramidal error, and the majority rely on = ,E(!Sp
visual observation,2,7,8 by which it is only possible to measure sN an"
pyramidal errors to the order of 1 arcmin ~Ref. 8!. H_nOE(i<z
In the new arrangement presented here, one can measure w<^2h}5
the prism angle and the pyramidal error separately or in 0 6v5/Xf
combination. This is possible because the measurements yl;$#aZB
are made simultaneously but with different techniques.
