We introduce a new class of partially coherent beams that can propagate over large distances without changing their transverse profiles and their coherence properties. Such beams are generated by an incoherent superposition of identical fully coherent beams of arbitrary form, whose axes lie on a cone.
© 2000 Optical Society of America
Andrei V. Shchegrov and Emil Wolf, "Partially coherent conical beams," Opt. Lett. 25, 141-143 (2000)