Wave front analyzer having liquid-crystal microlenses

US8937701B2 · kind B2 · utility

Assignee

• COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES · FR

Inventor

• Umberto Rossini · Voiron, FR

Key dates

• Filing date: Jul 4, 2011
• Grant date: Jan 20, 2015
• Expiry date: Jan 27, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G01J9/00
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A wavefront analyzer comprises a network of adjustable converging microlenses dividing an incident wavefront into multiple beams and creating a respective focal point for each beam, and a network of light-sensitive detectors placed behind to detect positions of these focal points. The microlenses network is formed from a liquid crystal layer operating in transmission with an array of electrodes forming liquid crystal pixels whose refractive index is controllable by a voltage applied individually to each electrode. Each converging microlens comprises a subset of pixels grouped in a region constituting the microlens, the pixels of a subset having indices that vary radially in a monotonic manner by distance from a central point of the region to its edges, enabling the microlens to operate in refractive mode. The number, position, size and focal length of the microlenses can be adjusted by the profile of the voltages applied to the array of pixels.