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Precision Micromachining with Femtosecond Pulse Lasers

Ultrashort pulse lasers are perfect for micro-machining various materials, offering precision and high quality without thermal damage. Their unmatched accuracy down to 100nm and ability to drill sub-wavelength holes make them ideal for a range of applications. This text discusses the advantages of femtosecond micro-machining and how it can be used to create sub-micron holes in materials like stainless steel.

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Precision Micromachining with Femtosecond Pulse Lasers

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  1. Diamond Ceramics Metals High Explosives Polymers Teeth Femtosecond Micromachinning Ultrashort pulses are ideal for micro-machining Ultrashort pulse lasers can precision machine many materials M.D. Feit, A.M. Komashko, A.M. Rubenchik, Lawrence Livermore National Laboratory

  2. Beam profile Threshold for cutting Beam focused to l/2 x Size of hole Ultrashort-pulse micro-machining can make sub-wavelength holes Because high-order nonlinear-optical processes are responsible for cutting, there is effectively a threshold for cutting. This means that careful control of the intensity can yield a very small hole

  3. Long- vs. short-pulse micromachining Long pulse Short pulse The main advantages of femtosecond micro machining are:  - No thermal damage: High machining quality, heat sensitive material machining  - Unmatched accuracy: Down to 100nm (very well defined ablation threshold) - No wavelength dependence: Any material can be machined with the same laser

  4. Femtosecond-Pulse Drilled Hole Sub-micron holes in stainless steel 540 nm Examples

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