High-power laser diode module for video projectors
6 August 2014
Opto-Electronics
OSRAM Opto Semiconductors is strengthening its position in light sources for laser projectors with its blue PLPM4 450 multi-chip package. OSRAM developers have adapted the ‘butterfly’ package for projection applications, resulting in a highly powerful laser module which can be more easily integrated in projectors.
Its package measures 25,5 by 35 mm and accommodates four copper bars with up to five blue laser chips connected in series and operated at 2,3 A each. This multichip product offers a light output of 50 W from a typical electrical input of 165 W, with wavelengths of 440 to 460 nm, while achieving an efficiency of 30%.
Blue laser diodes, in combination with a converter wheel which converts part of the blue light into the two primary colours of red and green, are used as the light source for laser projectors. Typically, to achieve sufficient brightness for professional applications, more than 20 individual laser diodes would need to be combined.
With its impressive optical output of 50 W, OSRAM’s new laser module offers projection brightness levels of more than 2000 lumen from only one package. If several modules are installed in a projector, brightness levels far in excess of 5000 lumens are possible – desirable, for example, for devices in large conference rooms.
The module’s design has also resulted in lower costs since it effectively reduces the price per optical Watt. Another cost benefit follows from the fact that installation and alignment of a multi-chip package involve less time and lower costs than for a large number of individual TO packages. The radiation from all the laser chips can therefore be collimated with a single lens array.
Volume production of the PLPM4 450 will start at the end of 2014, but OSRAM says samples will be available as from an unspecified date during our winter. The company will also be integrating the multi-chip package in a new generation of phaser (phosphor-laser) light modules for projection applications.
For more information contact Ryan Hunt, OSRAM Opto Semiconductors, +27 (0)79 525 1779, r.hunt@osram.com, www.osram-os.com
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