Instrumentation, Techniques, and Measurement

Single shot lateral shear interferometer with variable shear

[+] Author Affiliations
Claas Falldorf, Reiner Klattenhoff

BIAS – Bremer Institut für angewandte Strahltechnik, Klagenfurter Str.2, 28359 Bremen, Germany

Ralf B. Bergmann

BIAS – Bremer Institut für angewandte Strahltechnik, Klagenfurter Str.2, 28359 Bremen, Germany

University of Bremen, Faculty of Physics and Electrical Engineering, Applied Optics, Otto Hahn Allee 1, 28359 Bremen, Germany

Opt. Eng. 54(5), 054105 (May 20, 2015). doi:10.1117/1.OE.54.5.054105
History: Received November 28, 2014; Accepted April 23, 2015
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Abstract.  We present a shear interferometer that is based on an air wedge placed in the Fourier domain of a 4f-configuration as the shearing element. The two images are formed by the reflections from the front and reverse surfaces of the wedge. Due to a lateral displacement of the reflected beams in the Fourier domain, the interference pattern in the sensor domain is modulated by carrier fringes. Hence, the system is capable of single shot operation. The great advantage of this configuration over already existing shearing setups that make use of air wedges is that the shear can be set independently from the carrier modulation.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Claas Falldorf ; Reiner Klattenhoff and Ralf B. Bergmann
"Single shot lateral shear interferometer with variable shear", Opt. Eng. 54(5), 054105 (May 20, 2015). ; http://dx.doi.org/10.1117/1.OE.54.5.054105


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