Fiber-optic sheet lighting
View Patent ↗Laser light is coupled to optical fibers arranged in a sheet, which may be in the form of netting, mesh or fabric. Scattering centers or bends in the optical fibers allow the coupled light to escape from the sides of the fibers. Depending on the selection of wavelengths for the lasers, the resulting luminous sheet may be used for illumination of crops grown in vertical farms. The laser wavelengths excite plant photopigments for predetermined physiological responses, and the light source intensities may be temporally modulated to maximize photosynthesis and control photomorphogenesis responses. Each laser may be independently controlled, and at least one laser may emit ultraviolet-C radiation. The luminous sheet may be used for purification of air flowing through an air duct.
1. A lighting system comprising:
a sheet comprising multiple optical fibers, each optical fiber having a section that is side-emitting;
one or more laser light sources optically coupled to the multiple optical fibers; and
for each of the one or more laser light sources:
a diffractive optic beam splitter located to split a laser beam from the laser light source into multiple beams;
a beam collimator located to collimate the multiple beams; and
a fiber optic assembly into which the multiple collimated beams are coupled, wherein the multiple optical fibers in part form a portion of the fiber optic assembly, wherein each of the multiple collimated beams is coupled into a different one of the multiple optical fibers;
wherein the one or more laser light sources generate optical radiation with one or more monochromatic wavelengths in the range of 200 nm to 3000 nm.
2. The lighting system of claim 1 , wherein:
at least one of the multiple optical fibers comprises quartz; and
at least one of the one or more laser light sources generates optical radiation in the range of 200 nm to 280 nm.
3. The lighting system of claim 1 , wherein each optical fiber carries a single monochromatic wavelength of optical radiation.
4. The lighting system of claim 1 , wherein the multiple optical fibers are woven into the sheet.
5. The lighting system of claim 1 , wherein the sheet is a netting, a mesh or is perforated.
6. The lighting system of claim 1 , comprising one or more stiffeners in the sheet.
7. The lighting system of claim 1 , wherein the multiple optical fibers are arranged in the sheet or scattering features within the multiple optical fibers are located to provide a uniform light output per unit area of the sheet over a majority of the sheet.
8. The lighting system of claim 1 in which there are multiple laser light sources, the system comprising at least one dual-band dichroic mirror located to combine each of the multiple collimated beams from one of the multiple laser light sources with one of the multiple collimated beams from another of the multiple laser light sources.
9. The lighting system of claim 1 , further comprising two vertical growth substrates, wherein the sheet is located in a vertical plane between the two vertical growth substrates.
10. The lighting system of claim 9 , wherein:
at least one of the multiple optical fibers comprises quartz; and
at least one of the one or more laser light sources generates optical radiation in the range of 200 nm to 280 nm.
11. The lighting system of claim 1 , further comprising an air duct and a fan, wherein the sheet is located inside the air duct and the fan is located to move air through the air duct and through or over the sheet.
12. The lighting system of claim 11 , wherein:
at least one of the multiple optical fibers comprises quartz; and
at least one of the one or more laser light sources generates optical radiation in the range of 200 nm to 280 nm.
13. The lighting system of claim 1 in which there are multiple laser light sources, the system comprising, for each of the multiple laser light sources, a laser driver that temporally modulates a radiant flux of a laser beam emitted by the laser light source, wherein a modulation phase and a modulation frequency of each laser beam are independently controlled.
14. The lighting system of claim 1 in which there are multiple laser light sources and the multiple laser light sources include:
an InGaN blue-violet laser diode with a wavelength selected from the range of 400 nm to 410 nm;
an InGaN blue laser diode with a wavelength selected from the range of 445 nm to 465 nm;
an InGaN green laser diode with a wavelength selected from the range of 510 nm to 540 nm;
an AlInGaP red laser diode with a wavelength selected from the range of 650 nm to 670 nm; and
an AlGaAs far-red laser diode with a wavelength selected from the range of 720 nm to 750 nm.
15. The lighting system of claim 1 wherein at least one of the one or more laser light sources includes an AlGaN deep-ultraviolet laser diode with a wavelength selected from the range of 200 nm to 280 nm.
16. The lighting system of claim 1 , wherein the sheet comprises a reflective layer that reflects a portion of the optical radiation that is incident upon the reflective layer.
17. The lighting system of claim 1 , wherein the sheet emits the optical radiation from only one side of the sheet.
18. The lighting system of claim 1 , wherein the sheet emits the optical radiation from both sides of the sheet.
19. The lighting system of claim 1 , wherein the sheet emits the optical radiation from one or more areas of emission selected from a first side of the sheet, a second side of the sheet and one or more edges of the sheet, and each area of emission is controlled via its own channel or via a channel used to control another of said areas of emission.
20. A lighting system comprising:
a sheet comprising one or more optical fibers, each optical fiber having a section that is side-emitting; and
multiple laser light sources optically coupled to the one or more optical fibers;
wherein the multiple laser light sources generate optical radiation with one or more monochromatic wavelengths in the range of 200 nm to 3000 nm and the multiple laser light sources include:
an InGaN blue-violet laser diode with a wavelength selected from the range of 400 nm to 410 nm;
an InGaN blue laser diode with a wavelength selected from the range of 445 nm to 465 nm;
an InGaN green laser diode with a wavelength selected from the range of 510 nm to 540 nm;
an AlInGaP red laser diode with a wavelength selected from the range of 650 nm to 670 nm; and
an AlGaAs far-red laser diode with a wavelength selected from the range of 720 nm to 750 nm.
21. The lighting system of claim 20 , wherein:
at least one of the one or more optical fibers comprises quartz; and
at least one of the multiple laser light sources generates optical radiation in the range of 200 nm to 280 nm.
22. The lighting system of claim 20 wherein at least one of the multiple laser light sources includes an AlGaN deep-ultraviolet laser diode with a wavelength selected from the range of 200 nm to 280 nm.