Lateral Shearing Interferometry At 10 µm

Jacques Lewandowski; Bernard Mongeau; Maurice Cormier; F. Ledoyen; J. Lapierre

doi:10.1117/12.944133

12 April 1988 Lateral Shearing Interferometry At 10 µm

Jacques Lewandowski, Bernard Mongeau, Maurice Cormier, F. Ledoyen, J. Lapierre

Proceedings Volume 0883, Holographic Optics: Design and Applications; (1988) https://doi.org/10.1117/12.944133
Event: 1988 Los Angeles Symposium: O-E/LASE '88, 1988, Los Angeles, CA, United States

Abstract

A Mach-Zehnder interferometer is used to produce lateral shear between two infrared (10 μm) wave fronts. These two parallel sheared wave fronts, together with a tilted infra-red reference beam, are incident on a dynamic recording medium consisting of a thin oil film on a glass substrate: a phase hologram is obtained. Illumination of this hologram with a visible (HeNe) beam permits to visualize the characteristic shear interferogram in the direction of the +1 diffracted order. Practical realization of the Mach-Zehnder interferometer is easily carried out with long-wavelength interferometry, and experimental results include gaussian beam analysis, aluminum deposit thickness evaluation and afocal system inspection and adjustment. The properties of the recording medium are determined, in the context of infrared shearing interferometry, and shown to be satisfactory when compared to other recording media already reported.

Citation Download Citation

Jacques Lewandowski, Bernard Mongeau, Maurice Cormier, F. Ledoyen, and J. Lapierre "Lateral Shearing Interferometry At 10 µm", Proc. SPIE 0883, Holographic Optics: Design and Applications, (12 April 1988); https://doi.org/10.1117/12.944133

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