Rofin has introduced the PowerLine L series of lasers for high-speed micro material processing, with a special focus on photovoltaic manufacturing. The q-switched solid state lasers are specifically designed for micro material processing applications, which require high average power and high pulse energy. Examples include thin film removal on glass and flexible materials, ablation of dielectric layers, silicon processing together with drilling and cutting operations.
In the 1,064nm class, the PowerLine L 300 completes Rofin's laser range for edge deletion applications. Compared to the DQ series, which offers 500 to 1000W, the PowerLine L 300 features more than 200W laser power at 10kHz with smaller optical fibres and importantly an optimised 400μm square fibre. Compared to round fibres, square fibres provide greatest efficiency by machining a larger 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 suitability as a result of various research projects.
The laser source offers optimum beam characteristics and sufficient power for large scale production. Green lasers with 532nm show the desired near-surface absorption in silicon and can be equipped with a wide range of long-life optical components and fibres. With optimised fibres, a top-hat beam profile can be realised which provides homogenous energy distribution within the entire laser spot area.
The Nd:YAG lasers are efficiently diode pumped and designed to be reliable within an industrial environment and 24/7 operation. The PowerLine L 100 SHG uses a high performance SHG assembly with harmonic generator crystal for frequency conversion. The unique principle of q-switching makes peak pulse performances possible that are 1000 times higher than the CW laser power. Standard configuration includes a fibre delivery to the processing head. Optional accessories being offered include fibre outcoupling and scan head assemblies supporting scan speeds of >10 m/sec at unmatched precision.