Detection device and associated lidar system

US12352863B2 · kind B2 · utility

Assignee

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

Inventors

• Laurent Frey · Fontaine, FR
• Anis DAAMI · Grenoble, FR
• Stephane Fanget · Grenoble, FR

Key dates

• Filing date: May 10, 2021
• Grant date: Jul 8, 2025
• Expiry date: Apr 17, 2044

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/4206
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A detection device for a coherent lidar imaging system includes an integrated detector comprising a matrix array of pixels distributed over N columns and M rows and comprising an optical guide, called reference guide, configured so as to receive a laser beam, called reference beam, N optical guides, called column guides, coupled to the reference guide, each column guide being coupled to M optical guides, called row guides, the M row guides being configured so as to route part of the reference beam into each pixel of the column, called pixel reference beam, each pixel of the integrated detector comprising: a guided photodiode coupled to an optical detection guide, a diffraction grating, called pixel grating, configured so as to couple a portion of a beam illuminating the pixel into the guided photodiode, a coupler, called pixel coupler, configured so as to couple the pixel coupled beam and at least a fraction of the pixel reference beam into the detection guide, an electronic readout and preprocessing circuit.