femtosecond micromachinning metals ceramicsdiamond teeth high explosives ultrashort pulses are ideal...
TRANSCRIPT
Femtosecond Micromachinning
100 m
Metals
CeramicsDiamond
Teeth High Explosives
Ultrashort pulses are ideal for micro-machiningUltrashort pulses are ideal for micro-machining
Ultrashort pulse lasers can precision machine many materialsUltrashort pulse lasers can precision machine many materials
M.D. Feit, A.M. Komashko, A.M. Rubenchik, Lawrence Livermore National Laboratory
Polymers
x
Threshold for cutting
Beam focused to 2
Beam profile
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
Long pulse Short pulse
Long- vs. short-pulse micromachining
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