Diffused fiber-optic horticultural lighting
View Patent ↗Laser light emanates from optical components that are mounted on a substrate, each optical component being coupled to an optical fiber that delivers laser radiation combined from multiple lasers. A linear or elliptical holographic diffuser is located to diffuse the light emanating from the optical components. 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 is independently controlled. At least one laser emits ultraviolet-C radiation.
1. A horticultural lighting system comprising:
one or more optical components mounted on a substrate;
at least one optical fiber coupled to each optical component;
a linear or elliptical holographic diffuser located to diffuse light emanating from said optical components; and
one or more laser light modules optically coupled to said optical fibers, wherein each laser light module comprises:
a laser light source that produces a laser beam;
a diffractive optic beam splitter located to split the laser beam into multiple beams;
a beam collimator located to collimate the multiple beams;
a dual-band dichroic mirror located to combine each of the multiple beams with one of further multiple beams provided by a further laser light source, further diffractive optic beam splitter and further beam collimator, to result in multiple combined beams; and
a fiber optic assembly into which the multiple combined beams are coupled, wherein said optical fibers in part form a portion of the fiber optic assembly;
wherein the laser light source generates optical radiation with a wavelength in the range of 200 nm to 280 nm.
2. The horticultural lighting system of claim 1 , comprising a further linear or elliptical holographic diffuser that diffuses light in a direction that is orthogonal to a direction in which the linear or elliptical holographic diffuser diffuses light.
3. The horticultural lighting system of claim 1 , wherein each optical component includes a further linear or elliptical holographic diffuser that diffuses light in a direction that is orthogonal to a direction in which the linear or elliptical holographic diffuser diffuses light.
4. The holographic lighting system of claim 3 , wherein each further linear or elliptical holographic diffuser has a narrow beam, cosine, or batwing distribution.
5. The horticultural lighting system of claim 1 , wherein each optical component includes an organic or inorganic luminophore.
6. The horticultural lighting system of claim 1 , wherein the linear or elliptical holographic diffuser has a narrow beam, cosine, or batwing distribution.
7. The horticultural lighting system of claim 1 , comprising at least one further laser light source, wherein each further laser light source generates optical radiation with a different monochromatic wavelength within the range of 200 nm to 3000 nm.
8. The horticultural lighting system of claim 1 , wherein the laser light source includes an AlGaN deep-ultraviolet laser diode that generates the optical radiation.
9. The horticultural lighting system of claim 1 , comprising:
a laser driver that temporally modulates a radiant flux emitted by the laser light source; and
a controller that determines said temporal modulation in response to signals received from a timer and one or more sensors.
10. The horticultural lighting system of claim 9 , comprising at least one further laser light source, wherein a modulation phase and modulation frequency of each laser light source emission is independently controlled.