Abstract
Illumination sources based on phosphors, pumped by laser diodes (LDs), have seen rapid
developments over the past decade. Here, we present a new, to the best
of our knowledge, design that features both spectral richness and the
capability for high brightness. Complete design details and
operational characterization have been described. This basic design
can be extended in various ways to customize such lamps for different
operational requirements. A hybrid arrangement of both LEDs and an LD
is used to excite a mixture of two phosphors. The LEDs, in addition,
provide a blue fill-in to enrich output radiation and to tune the
chromaticity point inside the white region. The LD power, on the other
hand, can be scaled up to generate very high brightness levels that
are not achievable with pumping from LEDs alone. This capability is
gained using a special transparent ceramic disk that carries the
remote phosphor film. We also show that the radiation from our lamp is
free from speckle-producing coherence.
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering