J L Castagner and A R Jones 2003 J. Phys. D: Appl. Phys. 36 2359 doi:10.1088/0022-3727/36/19/007
J L Castagner and A R Jones1
Show affiliationsInspired by the Talbot effect, a grating projection system was designed. Periodic patterns were produced from a projection of a diffraction grating illuminated by a spherical wave of monochromatic coherent light. The diffracted light was collimated by a lens, the focal distance of which was at the centre of the incident spherical wave. Experiments demonstrated that the diffracted orders were also spherical waves centred on the same transverse plane as the incident light. The periodic illumination observed at different locations along the optic axis was proven to be the result of interference between the diffracted orders. It was demonstrated that this system could be used to measure velocities up to 20 m s−1 of particles crossing the fringes at distances up to 3 m.
42.79.Bh Lenses, prisms and mirrors
42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation
Issue 19 (7 October 2003)
Received 25 April 2003, in final form 7 July 2003
Published 17 September 2003
J L Castagner and A R Jones 2003 J. Phys. D: Appl. Phys. 36 2359
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