Linear VCSEL arrays
The present disclosure describes various linear VCSEL arrays, as well as VCSEL array chips incorporating such linear VCSEL arrays, and modules, host devices and other apparatus into which one or more of the linear VCSEL arrays are integrated. Implementations can include, for example, varying the aperture size of the VCSELs, tapering the shape of the transmission line, and/or changing the density of the VCSELs.
1. An optical source comprising:
a linear array of VCSELs arranged along a transmission line including a first conductive contact pad at the first end and a second conductive pad at a second end, wherein the VCSELs are electrically connected together, and are electrically connected to the transmission line,
wherein each of the VCSELs has a respective aperture, and wherein each of the apertures has a respective size such that apertures of VCSELs closer to the at least one of the first or second contact pads are smaller than apertures of VCSELs in a middle region of the transmission line; and wherein the transmission line is wider at the first end and the second end than in the middle region.
2. The optical source of claim 1 wherein the respective apertures of the VCSELs are increasingly larger in a direction away from at least one of the first or second contact pads.
3. The optical source of claim 1 wherein the respective sizes of the VCSEL apertures are such that the VCSELs are operable to emit substantially homogenous optical power.
4. The optical source of claim 1 wherein the respective sizes of the VCSEL apertures are such that the VCSELs are operable to project a non-homogenous optical power.
5. The optical source of claim 1 wherein a density of the VCSELs continuously increases from the first end toward the middle region, and wherein the density of the VCSELs continuously increases from the second end toward the middle region.
6. An apparatus for optical sensing or imaging comprising:
the optical source as in claim 1 operable to illuminate an object with radiation;
a current driver operable to activate the optical source;
a receiver operable to detect radiation reflected by the object; and
a processor operable to receive and process a signal proportional to the detected radiation.