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Multi-chip package boasts 50W blue light output

19 Jun 2014

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 PLPM4 450 module

Osram Opto Semiconductors developed a compact laser multi-chip package, the PLPM4 450 module, which can pack up to 20 blue laser chips.

Instead of taking the laborious approach and constructing a light source from individual laser diodes, it is now possible to reduce the complexity of laser projectors significantly. Developers also succeeded in doubling the optical output of the individual chips, with the result that the laser module now offers an overall output of 50W. This means that professional laser projectors can achieve a brightness level of more than 2,000lm with only one component.

Osram developers are the first to adapt the "butterfly" package for projection applications. The result is a powerful laser module that can be more easily integrated in projectors. Its package measures 25.5mm by 35mm and accommodates four copper bars with up to five blue laser chips connected in series and operated at 2.3A each. This multi-chip product offers a light output of 50W from a typical electrical input of 165W, with wavelengths of 440nm to 460nm. It achieves an efficiency of 30 per cent.

Unique optical output power

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. Up to now, to achieve sufficient brightness for professional applications more than 20 individual laser diodes had to be combined. With its impressive optical output of 50W, the laser module offers projection brightness levels of more than 2,000lm from only one package. If several modules are installed in a projector brightness levels far in excess of 5,000lm are then possible—for example for devices in large conference rooms. To achieve the high optical output of the PLPM4 450, developers at Osram optimised the chip parameters to double the single-chip output from 1.6W to 3.2W and also improved the thermal resistance of the module.

Lower system costs for laser projectors

This unique technical performance is particularly attractive, and so too are the costs for the new laser module. Thanks to the special design and the improved optical output power of the individual chip, the price per optical watt could be significantly reduced. Another price benefit comes from the greatly reduced production costs—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. Samples will be available in summer. The Osram Specialty Lighting Business Unit will also be integrating the multi-chip package in a new generation of phaser light modules for projection applications. Phaser in this case is a hybrid word formed from phosphor and laser. Phaser light modules based on the multi-chip package will feature a particularly compact design and will be capable of being used in combination, making them very easy to integrate in existing projector architectures.

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