In high-brightness material processing applications, diode lasers are currently mostly used as pump sources. Beam combining methods such as "Dense Wavelength Division Multiplexing" (DWDM) and "Coherent Beam Combining" (CBC) could also help diode lasers achieve a market breakthrough when used directly. The FBH has made significant progress in this regard.
In cooperation with partners in research and industry, new types of semiconductor light sources were developed to enable particularly effective, powerful and efficient beam bundling.
For example, novel single-mode laser bars can be combined using DWDM. The output power of several diode lasers with slightly different wavelengths is superimposed to form a brilliant beam.
The external spectral stabilization and combination of broad area lasers and bars is already used in commercially available systems, which can, however, be made more efficient using optimized components.
For spectrally narrow-band power scaling of several light sources, CBC can be used, in which the spatial phase is controlled by several coherently-coupled lasers. Novel amplifiers are suitable for this, whose optical power can be combined into a perfect beam using CBC.
- single-pass tapered semiconductor optical amplifiers with high beam quality for efficient coherent beam combining [publication]
- laser bars with narrow vertical far field for low loss, smile-insensitive external spectral stabilization [publication]
- efficient high-power bars of single-mode emitters for dense wavelength multiplexing (DWM) application [publication]
- high-brightness grating-stabilized mini-bars tailored for spectral beam combination applications [publication]