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Axially symmetric on-axis flat-top beam

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Abstract

A synthesis method for arbitrary on-axis intensity distributions from axially symmetric fields is developed in the paraxial approximation. As an important consequence, a new pseudo-nondiffracting beam, the axially symmetric on-axis flat-top beam (AFTB), is given by an integral transform form. This AFTB is completely determined by three simple parameters: the central spatial frequency Sc, the on-axis flat-top length L, and the on-axis central position zc. When LSc1, this AFTB can give a nearly flat-top intensity distribution on the propagation axis. In particular, this AFTB approaches the nondiffracting zero-order Bessel J0 beam when L. It is revealed that the superposition of multiple AFTB fields can give multiple on-axis flattop intensity regions when some appropriate conditions are satisfied.

© 2000 Optical Society of America

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