Nonlinear digital imaging

TL;DR

This paper introduces a novel nonlinear imaging approach using electro-optic spatial light modulators with feedback, enabling flexible, high-speed, and broad-bandwidth imaging that surpasses traditional physical media constraints.

Contribution

The authors demonstrate that SLMs can replace physical nonlinear media in imaging systems, allowing for arbitrary functions, high-speed operation, and applicability at various power levels.

Findings

Successful experimental demonstration with coherent light.

Effective imaging at high power and single-photon levels.

Broad bandwidth operation enabled by SLMs.

Abstract

Nonlinear imaging systems can surpass the limits of linear optics, but to date they have all relied on physical media (e.g. crystals) to work. These materials are all constrained by their physical properties, such as frequency selectivity, environmental sensitivity, time behavior, and fixed nonlinear response. Here, we show that electro-optic spatial light modulators (SLMs) can take the place of traditional nonlinear media, provided that there is a feedback between the shape of the object and the pattern on the modulator. This feedback creates a designer illumination that generalizes the field of adaptive optics to include object-dependent patterns. Unlike physical media, the SLM response can provide arbitrary mathematical functions, operate over broad bandwidths at high speeds, and work equally well at high power and single-photon levels. We demonstrate the method experimentally for both coherent and incoherent light.