Measurement of residual wedge angle of a high optical quality transparent parallel plate with a multipass optical configuration

Sanjib Chatterjee; Y. Pavan Kumar

doi:10.1117/1.3431666

1 May 2010 Measurement of residual wedge angle of a high optical quality transparent parallel plate with a multipass optical configuration

Sanjib Chatterjee, Y. Pavan Kumar

Author Affiliations +

Optical Engineering, Vol. 49, Issue 5, 053605 (May 2010). https://doi.org/10.1117/1.3431666

Abstract

A new technique of wedge angle measurement of a transparent nearly parallel plate (PP) is presented. In this technique, the single-pass angular deviation suffered by a pair of mutually parallel, laterally separated pencil beams is enhanced by using a multipass cavity formed with two right-angle prisms. The resultant angular deflection is converted to linear deviation by means of a Fourier transform lens (FTL), which focuses the pencil beams on to its focal plane. A two-dimensional CCD detector array placed at the focal plane of the FTL measures the linear shift of the intensity centroid (IC) of the resulting Young's fringes formed due to the superposition of the laterally separated pencil beams. The wedge angle is determined from the measured value of the linear shift of the IC due to the PP.

©(2010) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Sanjib Chatterjee and Y. Pavan Kumar "Measurement of residual wedge angle of a high optical quality transparent parallel plate with a multipass optical configuration," Optical Engineering 49(5), 053605 (1 May 2010). https://doi.org/10.1117/1.3431666

Published: 1 May 2010

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