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Another commercially available application of LPP technology are laser headlights. To avoid moving parts, laser headlights make use of static phosphor assemblies, but they operate at only a few Watts of laser power. A static phosphor assembly consists of a ceramic phosphor that is bonded onto a heat spreader. Due to their good thermal and optical properties, static ceramic phosphors are excellent light converters even at higher powers. They enable high luminance light sources with a luminous flux that is far beyond the flux needed for car headlights. Static converters will also improve the performance of light sources for microscopy, machine vision and any other etendue limited specialty lighting application. We investigate factors that determine the achievable power and luminance such as irradiance limit, conversion efficacy, spot confinement and cooling. Experimental and numerical results are presented. |
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