With its new PowerLine L series, Rofin Baasel Lasertech, Starnberg, Germany, introduces q-switched solid state lasers specifically designed for micro-material processing applications that require high average power and high pulse energy. Examples are thin film removal on glass and flexible materials, ablation of dielectric layers, silicon processing, drilling and cutting.
In the 1064 nm class, the PowerLine L 300 completes Rofin's laser range for edge deletion applications. Whereas Rofin's DQ series offers 500 to 1000 W, the PowerLine L 300 features more than 200 W laser power at 10 KHz and smaller optical fibers, especially an optimized square fiber with 400 micron diameter. Compared to round fibers, square fibers provide the highest efficiency by machining a bigger area per pulse.
Selective opening of dielectric layers and direct laser doping currently draw a lot of interest in crystalline solar cell manufacturing. For both applications, the frequency-doubled PowerLine L 100 SHG has already proven its applicability in various research projects. The laser source offers optimum beam characteristics and sufficient power for large production scales. Green lasers with 532 nm show the desired near-surface absorption in silicon and can be equipped with a wide range of long-living optical components and fibers. With optimized fibers, a top-hat beam profile can be realized that provides homogenous energy distribution within the entire laser spot area.
The Nd:YAG lasers are efficiently diode pumped and designed for industrially reliable 24/7 operation. The PowerLine L 100 SHG uses a high performance SHG assembly with harmonic generator crystal for frequency conversion. The principle of q-switching makes peak pulse performances possible that are 1000 times higher than CW laser power. Standard configuration includes a fiber delivery to the processing head. Optionally accessories include fiber outcoupling and scan head assemblies supporting scan speeds of >10 m/sec.