LIDAR DEVICE FOR SCANNING MEASUREMENT OF A DISTANCE TO AN OBJECT
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United States of America
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Issued Date -
Mar 20, 2025
app pub date -
Jul 18, 2022
filing date -
Jul 18, 2022
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Abstract
A LiDAR device (14) for scanning measurement of a distance to an object (12) comprises a photonic integrated circuit (52) with a plurality of optical waveguides (38) and a plurality of couplers 40). Each coupler (40) emits light guided in the optical waveguide (38) into free space and/or couples light propagating in free space into the optical waveguide (38). A collimating optical system (44) collimates light beams emitted by the couplers (40) and/or focuses collimated light beams. Microlenses (54; 54a, 54b) form real or virtual images of associated couplers (40), said images being arranged in an object field (56) of the collimating optical system (44). The collimating optical system (44) has a collimator numerical aperture which is greater than each of the coupler numerical apertures. Each microlens (54; 54a, 54b) has a collimator-side numerical aperture that is greater than its coupler-side numerical aperture. In this manner, insertion losses caused by NA mismatch are reduced.
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