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8 May 2012 Controlled USP laser ablation strategies for shaping optics
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Non-linear absorption and athermal ablation effects are two of the most attractive benefits of ultrashort pulsed (USP) laser radiation for optics manufacturing. The conventional generation of complex shapes still is a challenging problem for engineers and constrains the outcome of new products and applications in combination with aspheric and freeform optical shapes. To create a process chain for these shapes based on USP is the definition of task. We accomplished experiments with a 18W lasersystem (<15ps) and analysed ablation strategies beginning from selective to three dimensional removal on different optical materials. Therefore dependent variables like roughness (RMS), irregularities (IRR) in terms of shape accuracy and sub-surface damages (SSD) give suggestions for parametrical improvements. The aim is to substitute grinding procedures by creating path-time-controlled removal functions to achieve polishable surface quality.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Christian Schindler, Jan Giesecke, Jens Bliedtner, Hartmut Mueller, Sebastian Waechter, and Volkmar Giggel "Controlled USP laser ablation strategies for shaping optics", Proc. SPIE 8428, Micro-Optics 2012, 84281Z (8 May 2012);


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