ILT develops diamond lenses: greatly reduces the weight of material processing lasers

Diamond has some remarkable properties: for example, its refractive index is 2.4, which is very high, and enables thinner optical components with the same optical power. Their thermal conductivity is 2000W/mK, which is more than 1400 times higher than optical glass. In addition to high damage thresholds, these characteristics make diamonds very meaningful for high power optical systems. To date, polycrystalline diamond substrates have only served as windows for carbon dioxide lasers. Due to the presence of impurities and defects, they absorb and scatter laser radiation at an emission wavelength of about 1 [mu]m, making them unsuitable for fiber lasers. Although single crystal diamonds do not have the above problems, they are more difficult to manufacture.
For many years, the Fraunhofer Institute for Solid State Physics (IAF) has been studying the production of single crystal diamond. Continuous vapor deposition (CVD) reactors developed at IAF have stable plasma characteristics and are capable of producing substrates up to several millimeters thick. Up to 60 diamonds can be produced simultaneously. At a rate of formation of up to 30 microns per hour, the reactor can produce materials having a pore size of about 10 mm.

Diamond optical laser head weight reduction of 90%
These synthetic single crystal diamond lenses exhibit low absorption and low birefringence characteristics. Several samples have been tested for anti-reflective coating and incorporated into fiber laser cutting heads.
Martin Traub from the Flaushof Institute of Laser Technology (ILT) said: "We have optimized the complete laser optics system for diamond lenses for the first time. For this reason, the weight of the cutting head has been reduced by nearly 90%."
The 7mm diameter lens has passed the 2kW laser power test without any problems. Now, the partner has established a cutting test system with a 1kW fiber laser. Integrated in the cutting head is the supply of water cooling and shielding gas, but process monitoring has not yet been planned. A small cutting head is currently being used for the first test.
The new optical system greatly increases the flexibility of laser cutting. The small size allows the system to handle hard-to-reach areas, while the lighter weight facilitates highly dynamic processes in 3D processing.
In addition, the optical system will also be exhibited at the 2017 Photonics Technology Exhibition in Munich, Germany. (text / Oscar translation)

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