New paper in Journal of Physics – Photonics showing a compact achromatic Fourier transform system
Our recent paper published in Journal of Physics – Photonics is entiled Compact achromatic optical Fourier transform system using  geometric-phase lenses.
In this work we present a new configuration to achieve an achromatic all-optical Fourier transform (FT) using two blazed diffractive lenses and one non-dispersive lens. Different configurations are identified by imposing constraints on the ray matrix of the optical system, minimizing the wavelength dependence of both the transversal location of the FT plane and the FT spatial scaling.
Experimental verification is carried out using geometric-phase (GP) flat diffractive lenses and an achromatic refractive lens. Furthermore, one identified novel configuration is symmetric. This symmetric triplet configuration enables a straightforward implementation in a reflective geometry that reduces the number of elements to a single GP lens combined with a mirror, thus leading to a highly-compact implementation. Experimental results are presented that validate the proposed systems.
This work is part of the PhD Thesis of Santiago RÃos.