DIODE LASERS
applications. It’s always a question of which application cannot be addressed at the moment with other technologies. Customers are willing to start with lower power and slower speed with the understanding that power levels will increase.’ Nuburu’s direct diode blue laser has a
Schematic of a Coherent-Dilas T-bar plate
lasers from monolithic multi-emitter bars. Teir expertise is in bar mounting, which involves proper cooling designs and material selection, beam shaping for collimation, and coupling the light into a fibre. Coherent-Dilas’ T-bars are the building
block for pumping multi-kilowatt industrial fibre lasers, and are manufactured in high volume, automated production. ‘Coherent- Dilas can use its manufacturing capability and even the platform for the fibre laser pump, for fabricating blue diode bars in the future,’ stated Dr Florian Lenhardt, product line manager for high power diode lasers at
Coherent-Dilas. ‘Te key is a very compact, modular and cost-efficient design, which is power scalable.’ Lenhardt added that one of the targets for
the Blaulas project is to achieve homogeneous blue diode wafers, so bars can be cleaved from the material, and not only single emitters. Ullmann stated that power and beam
quality are important to make blue diode lasers commercially attractive. ‘Applications exist where you can work with a few hundred watts with 30-60mm mrad beam quality. Tese need to be verified,’ he said. ‘But if you have higher output power you will open more
brightness of 20mm mrad, which is not an issue for welding, noted Pelaprat. Te beam quality, however, means that ‘this particular laser, at this stage, is not yet ready for cutting applications or some of the powder bed applications,’ he said. Te AO-150 and the 500W version will be suitable for welding, brazing and laser metal deposition. Te wall plug efficiency of Nuburu’s laser is
a little better than half of that of a fibre laser. Gallium nitride, as a semiconductor, has an efficiency of roughly half of the infrared diode semiconductor, but it is direct generation of blue light from electricity. However, ‘the application efficiency is probably going to be four or ten times better,’ noted Pelaprat. ‘So, in terms of net energy, we are much better than an infrared laser. You lose half on one side, but you gain a factor of four to ten on the other side.’
Coherent-Dilas
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