The general coherent-mode structure of a propagation-invariant field is found as the solution of the differential equation for propagation of the coherent modes of said field. It is shown that three kinds of the propagation-invariant fields exist. Examples of propagation-invariant fields of the three kinds are discussed. © 2001 Elsevier Science B.V. All rights reserved.
Ostrovsky, A. S., Martínez-Niconoff, G., & Ramírez-San-Juan, J. C. (2001). Coherent-mode representation of propagation-invariant fields. Optics Communications, 195(1–4), 27–34. https://doi.org/10.1016/S0030-4018(01)01302-5