Light source array having plural super luminous or luminescent diode (SLED) arrays
A source assembly for providing light. The source assembly comprises a source element array, and a scanning mirror assembly. The source element array includes a super luminous diode (SLED) array of SLEDs that are configured to emit light. The SLED array is on a single chip. Each SLED in the SLED array may emit light in the same color channel (e.g., green). There may be multiple SLED arrays that each are on respective chips and each are associated with a different color channel (e.g., one is red, one is blue, and one is green). The scanning mirror assembly is configured to scan light emitted from the SLED array (and/or multiple SLED arrays) to an entrance location of an output waveguide (e.g., of a waveguide display) as scanned image light.
1. A source element array comprising:
a first superluminous light emitting diode (SLED) array of SLEDs that are arranged on a single chip, the first SLED array configured to emit light in a first optical band; and
a second SLED array of SLEDs that are arranged on a single chip, the second SLED array configured to emit light in a second optical band,
wherein the light emitted from the first SLED array and the light emitted from the second SLED array are combined to form combined light.
2. The source element array of claim 1 , wherein the SLEDs in the first SLED array are arranged in a one-dimensional linear array.
3. The source element array of claim 2 , wherein a pitch between adjacent SLEDs in the first SLED array is at least 30 microns.
4. The source element array of claim 2 , wherein each SLED of the first SLED array includes a respective ridge waveguide structure that confines an optical mode of light emitted by an active region such that the confined optical mode propagates in a first dimension.
5. The source element array of claim 1 , wherein a controller is configured to adjust control signals applied to SLEDs in the first SLED array and control signals applied to the second SLED array to mitigate banding caused by scanning of the combined light.
6. The source element array of claim 1 , wherein the first optical band is different than the second optical band.
7. The source element array of claim 1 , wherein the first SLED array is on the same chip as the second SLED array.
8. The source element array of claim 1 , wherein the first SLED array is on a different chip than the second SLED array.
9. The source element array of claim 1 , wherein the source element array is part of a waveguide display.
10. The source element array of claim 1 , wherein the first optical band is in the infrared.
11. A waveguide display comprising:
a first superluminous light emitting diode (SLED) array of SLEDs that are arranged on a single chip, the first SLED array configured to emit light in a first optical band; and
a second SLED array of SLEDs that are arranged on a single chip, the second SLED array configured to emit light in a second optical band, wherein the light emitted from the first SLED array and the light emitted from the second SLED array are combined to form combined light; and
an output waveguide configured to direct image light to an eyebox of the waveguide display, wherein the image light is formed using at least some of the combined light.
12. The waveguide display of claim 11 , wherein the SLEDs in the first SLED array are arranged in one dimension.
13. The waveguide display of claim 11 , wherein each SLED of the first SLED array includes a respective ridge waveguide structure that confines an optical mode of light emitted by an active region such that the confined optical mode propagates in a first dimension.
14. The waveguide display of claim 11 , further comprising:
a controller configured to adjust control signals applied to SLEDs in the first SLED array and control signals applied to the second SLED array to mitigate banding caused by scanning of the combined light.
15. The waveguide display of claim 11 , further comprising:
a combining assembly configured to combine the light in the first optical band and the light in the second optical band to form the combined light.
16. The waveguide display of claim 11 , wherein the first optical band is different than the second optical band.
17. The waveguide display of claim 16 , wherein the first optical band is in the infrared, and light in the first optical band is used for eye tracking and the light in the second optical band is used to generate the image light.
18. The waveguide display of claim 17 , wherein the first SLED array is on the same chip as the second SLED array.