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We describe a simple procedure for obtaining diffractionless beams in freespace and certain GRIN. Our novel solutions contain as particular cases some previously known dif fractionless beams. 1.
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Jorge Ojeda-Castaneda, A. Noyola-Isgleas, "Diffractionless beams in free-space and GRIN," Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); https://doi.org/10.1117/12.22191