Optical heterodyne method to measure phase objects

A new and simple interferometer to measure the physical properties of phase objects based on the heterodyne principle is presented. A laser beam is used as a stylus probe, an oscillating grating as a modulator element and a lock-in amplifier as a demodulator system. With this interferometer one can...

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Bibliographic Details
Published in:Optics communications 2003-03, Vol.218 (1), p.73-79
Main Authors: Baltazar, Rosario, Solano, C., Martı&#x0301, nez-Ponce, G., Camacho P, Alma A.
Format: Article
Language:English
Subjects:
Biological and medical applications
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Interferometers
Metrological applications
Optical instruments, equipment and techniques
Optics
Physics
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Summary:A new and simple interferometer to measure the physical properties of phase objects based on the heterodyne principle is presented. A laser beam is used as a stylus probe, an oscillating grating as a modulator element and a lock-in amplifier as a demodulator system. With this interferometer one can measure refraction index and thickness in phase objects. Its performance and its theoretical model are described in detail. Experimental results show the sinusoidal variations of refractive index in gratings, these are in the order of 10 −5 corresponding to a phase change in the order of milliradians. Also the phase in glass wedges with incremental thicknesses is obtained.
ISSN:0030-4018
1873-0310
DOI:10.1016/S0030-4018(03)01109-X