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Wavefront sensor with Fresnel zone plates for use in an undergraduate laboratory
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View: Figures


Image of Fig. 1.
Fig. 1.

Principle of a Hartmann wavefront detector.

Image of Fig. 2.
Fig. 2.

(a) Normalized radial distribution of the light intensity within the spots created by Fresnel zone plates with a given number of transparent zones (symbols) and by refractive lenses of the same aperture and focal length (solid lines). (b) The radius at half of the maximum intensity of the spot created by a zone plate as a function of the number of zones.

Image of Fig. 3.
Fig. 3.

Experimental setup for wavefront measurements. Lenses and , wavefront-distorting element WD, and mask M.

Image of Fig. 4.
Fig. 4.

Sample images from the wavefront sensor obtained with the masks shown. The scale is maintained between the images and the masks. (a) and (b) .

Image of Fig. 5.
Fig. 5.

Geometry used in the reconstruction of the wavefront.

Image of Fig. 6.
Fig. 6.

Typical deviations of a single measurement of a flat wavefront from the arithmetic mean of 20 measurements in intervals for the mask with focal lengths of (a) and (b) .

Image of Fig. 7.
Fig. 7.

Sample distortions of the wavefront of a collimated laser beam propagating in a turbulent air flow induced by a soldering iron located beneath the beam. The focal lengths of the zone plates used are equal to (a) and (b) . (c) The wavefronts shown in (b) after subtracting a flat, tilted wavefront.

Image of Fig. 8.
Fig. 8.

(a) The wavefront of a collimated beam reflected from a spherical mirror with an angle of incidence of . (b) The sections of the wavefront in the tangential and sagittal planes.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Wavefront sensor with Fresnel zone plates for use in an undergraduate laboratory