|Title||Ptychographic amplitude and phase reconstruction of bichromatic vortex beams|
|Publication Type||Journal Article|
|Year of Publication||2018|
|Authors||Esashi, Y, Liao, C-T, Wang, B, Brooks, N, Dorney, KM, Hernandez-Garcia, C, Kapteyn, H, Adams, D, Murnane, M|
|Keywords||hyperspectral fields, orbital angular momentum|
We experimentally demonstrate that ptychographic coherent diffractive imaging can be used to simultaneously characterize the amplitude and phase of bichromatic orbital angular momenta-shaped vortex beams, which consist of a fundamental field, together with its copropagating second-harmonic field. In contrast to most other orbital angular momentum characterization methods, this approach solves for the complex field of a hyperspectral beam. This technique can also be used to characterize other phase-structured illumination beams, and, in the future, will be able to be extended to other complex fields in the extreme ultraviolet or X-ray spectral regions, as well as to matter waves.