Blue laser diode for professional projectors

April 25, 2012 // By Christoph Hammerschmidt
With the high power laser diode PL TB450, Osram Opto Semiconductors intends to strengthen its role in lasers on indium-gallium-nitride basis. Mounted in a compact TO56 package, the blue laser diode features an optical power of 1.4W. Thus it is particularly suitable for high-quality professional projectors. Other applications reach from laser systems for stage and decoration illumination to medical devices.

Professional projectors with a luminous flux of more than 1000 lumen are the main area of application for the new laser diode PL TB450. With its wavelength of 450 nm it produces exactly the desired blue, and with 1.4 W (at room temperature and a current of 1.2 A) the high optical power required. Thanks to its excellent energy efficiency of 27 %, the temperature of the laser will rise only slightly. Hence it boasts a long service life – depending on its use up to 10,000 operating hours at 40°C in continuous operation. The long lifetime of the laser diodes facilitates a maintenance-free operation of projectors at low energy consumption.

There are various approaches for the use of the laser diode in a professional projector: Usually red LEDs are combined with blue high power lasers. The green color emerges when blue lasers excite a special phosphor to emit light. Red light can also be generated this way so that the projector light source can be designed without red LED, thus turning out even smaller, if required.

The basic technologies for indium-gallium-nitride laser diodes had been developed in the course of the MOLAS Project, supported by the German Federal Ministry of Education and Research.

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