Orbital angular momentum coherent state beams.

Aguirre-Olivas, D., Mellado-Villaseñor, G., Perez-Garcia, B., & Rodriguez-Lara, B. M. (2025). Orbital angular momentum coherent state beams. Optics Letters, 50(4), 1121. https://doi.org/10.1364/ol.547539

ABSTRACT

Paraxial propagation through isotropic, homogeneous, linear media exhibits invariance under rotations around the propagation axis, a symmetry described by the su(2) Lie algebra. We explore a family of paraxial beams that exploit this symmetry, constructed as linear superpositions of Laguerre-Gaussian beams (LGBs), serving as optical analogs of generalized SU(2) Lie group coherent states. A single complex parameter controls a smooth transition between Laguerre-Gaussian and Hermite-Gaussian beams (HGBs), producing intermediate beams that blend the characteristics of both families. Our beams exhibit propagation-invariant properties, up to a scaling factor, a highly desirable feature for optical applications. Experimental validation via digital holography demonstrates the practical feasibility of our approach.



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