US 12,188,763 B2
Dot projector including hybrid refractive-diffractive optical elements
John Michael Miller, Ottawa (CA); Vincent V. Wong, Los Altos, CA (US); and Lei Yang, Albuquerque, NM (US)
Assigned to Lumentum Operations LLC, San Jose, CA (US)
Filed by Lumentum Operations LLC, San Jose, CA (US)
Filed on Dec. 17, 2021, as Appl. No. 17/644,974.
Claims priority of provisional application 63/260,993, filed on Sep. 8, 2021.
Prior Publication US 2023/0072500 A1, Mar. 9, 2023
Int. Cl. G01B 11/25 (2006.01); G02B 27/30 (2006.01); H01S 5/42 (2006.01)
CPC G01B 11/2513 (2013.01) [G02B 27/30 (2013.01); H01S 5/423 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A dot projector, comprising: a vertical-cavity surface-emitting laser (VCSEL) chip;
one or more collimating elements to collimate light emitted by the VCSEL chip,
wherein an effective focal length of the one or more collimating elements is larger than an optics length of the dot projector, and
wherein the optics length is measured from an emitting surface of the VCSEL chip to an outer surface of an optical element of the dot projector; and the optical element including:
a first surface defined by a periodic optical phase function and configured to replicate the light after collimation by the one or more collimating elements, and
a second surface defined by an aberration-correcting phase function and configured to correct spot aberrations in a dot pattern resulting from tiling or splitting of the light by the periodic optical phase function.