What we believe to be a new technique for the fabrication of a penta prism (PP) with high accuracy right angle deviation of the incident beam is presented. We derive simple formulas relating to the error in right angle deviation (∈) with the errors in 45° (β) and 90° (δ) angles of a PP, and we determine ∈ from the angle \left({\in }_r\right) between the plane wavefronts reflected from the right angled surfaces (external Fresnel reflection on the entrance surface and internal Fresnel reflection on the exit surface) of a PP and the angular error (δ) between the same surfaces. The error in right angle deviation ∈ is determined from the measurement of {\in }_r using an autocollimator and a Fizeau interferometer, and ∈ is corrected to a high order of accuracy during the final stage of polishing one of the slanted surfaces of the PP. A new technique to determine the magnitude and direction of the small values of {\in }_r is proposed and verified. The result for a PP is presented.

© 2007 Optical Society of America

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