Liquid-crystal optical system

A liquid crystal optical system, comprising:

• a variable-scattering electrically controllable device forming a first device, including a following stack of layers:
• a transparent first electrode with a first connecting surface and an opposite external surface,
• a transparent second electrode with second connecting surface and with an opposite external surface, with a first electric field between the first and second electrodes,
• a first dielectric electroactive layer with a first main face on the side of the first connecting surface and a second main face made of a first material including:
• first liquid crystals,
• polymers forming a polymeric network, the first liquid crystals being stabilized by the polymeric network,
• the first material exhibits, from a temperature T1, a mesophase P, wherein the first material includes a set of domains, which include two-dimensional topological defects,
• wherein the first material includes at least a first dichroic dye,
• wherein the first electroactive layer has an optical response depending on a state of polarization of an incident light on the first device,
• and the liquid crystal optical system includes, facing the first device, an electroswitchable device with variable polarization forming a second device, the second device including:
• third and fourth transparent electrodes with a second electric field between the third and fourth electrodes,
• a second electroactive layer made of a second material with a third main face on the side of the third electrode and an opposite fourth main face including:
• second liquid crystals which are nematic, and
• second dichroic dyes,
• and wherein the third electrode extends between the second electroactive layer and the first device.