Instrumentation, Measurement, and Metrology

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

[+] Author Affiliations
Sanjib Chatterjee

Government of India, Raja Ramanna Centre for Advanced Technology, Department of Atomic Energy, Indore 452013 India

Y. Pavan Kumar

Government of India, Raja Ramanna Centre for Advanced Technology, Department of Atomic Energy, Indore 452013 India

Opt. Eng. 49(5), 053605 (May 28, 2010). doi:10.1117/1.3431666
History: Received January 13, 2010; Revised March 24, 2010; Accepted April 06, 2010; Published May 28, 2010; Online May 28, 2010
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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.

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© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Sanjib Chatterjee and Y. Pavan Kumar
"Measurement of residual wedge angle of a high optical quality transparent parallel plate with a multipass optical configuration", Opt. Eng. 49(5), 053605 (May 28, 2010). ; http://dx.doi.org/10.1117/1.3431666


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