ROFIN debuts lasers for high-speed edge ablation of thin film solar modules - Photovoltaics World
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ROFIN debuts lasers for high-speed edge ablation of thin film solar modules

February 17, 2011 -- With its PowerLine L 400 and 100 series, ROFIN introduced q-switched solid state lasers designed for micro material processing applications that require high average power and high pulse energy: thin film removal on glass and flexible materials, ablation of dielectric layers, silicon processing, drilling and cutting.

Building on its Powerline L 300 for edge ablation of thin film layers in the production of a-Si/μ-Si, CdTe and CIS solar cells in the 1064nm class, ROFIN is introducing the PowerLine L 400 featuring higher laser power and shorter pulse length. This targets shorter cycle times.

The Powerline L 100 SHG with top hat beam profile suits selective emitter solar cells. Selective opening of dielectric layers and direct laser doping currently are emerging for crystalline (cSi) solar cell manufacturing. The frequency-doubled PowerLine L 100 SHG has been used in mass production at various customers. The laser source offers optimum beam characteristics and sufficient power for large production scale. Green lasers with 532nm show the desired near-surface absorption in silicon and can be equipped with various optical components and fibers. ROFIN's patent-pending beam delivery has a rectangular shaped fiber. This provides a top-hat beam profile and homogenous energy distribution within the entire laser spot area at sufficient depth of focus.

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 unique principle of q-switching make peak pulse performances possible that are a 1000 times higher than the cw laser power. This process is repeated with frequencies up to 50,000Hz. The pulse lengths are in the range of 50 to 300ns. Standard configuration includes a fiber delivery to the processing head. Optionally accessories, fiber outcoupling and scan head assemblies, support scan speeds of >10 m/sec at high precision.

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