CRI-booster white laser fiber source
In one aspect, an optical system for delivering light into an optical fiber is disclosed, which comprises a phosphor-converted white light source for generating white light, a red light emitting diode (LED) for generating red light, and a light-delivery system for delivering at least a portion of said white light and said red light into an input port of an optical fiber.
1. A method of delivering light into an optical fiber, comprising:
directing white light into an optical fiber via an input port thereof, wherein said white light is capable of generating white light with a flux in a range of 100 to about 400 lumens,
directing red light into said inlet of the optical fiber to cause mixing of the red light with the white light such that light exiting an output of the optical fiber exhibits a color-rendering-index (CRI) of at least about 80.
2. The method of claim 1 , wherein the light exiting the output port of the optical fiber exhibits a color temperature equal to or less than about 5000 K.
3. The method of claim 1 , wherein said white light and said red light are directed into the input port of the optical fiber via at least one light-delivery system.
4. The method of claim 3 , wherein said at least one light-delivery system comprises two or more lenses configured for focusing the white light and the red light onto the input port of the optical fiber.
5. The method of claim 4 , wherein said at least one light delivery system further comprises a light pipe optically coupled at a proximal end thereof to a source for generating said red light and optically coupled at a distal end thereof to said one or more lenses to deliver the red light thereto.
6. The method of claim 4 , wherein said at least one light-delivery system comprises an elliptical reflector at least partially surrounding said one or more lenses for directing at least a portion of any of the white light and the red light into said input port of the optical fiber.