Prediction of ablated region of ultrafast-pulse laser processing for alumina

Experimental study on picosecond pulsed laser various materials micro-structure processing

“…The focused beam is finally incident on the upper surface of the working piece. 1 (ii) The 532 nm laser beam is collimated with lens pair of L3 and L4. After its reflection with the 45°mirror M2, the green laser beam is reflected again by mirror M3.…”

“…[1][2][3][4][5] Conventional materials have a thermal relaxation time shorter than 10 ps, accordingly, when a pulse shorter than this duration is directed onto the work pieces, the thermal deposition can be faster than its diffusion. 5,6 Besides this, laser pulses with duration shorter than 10 ps can effectively avoid the occurrence of plasma in the air in front of the work pieces and the resulting laser beam deformation and scattering.…”

3D transient model to predict temperature and ablated areas during laser processing of metallic surfaces

“…10 Ho et al solved the 2D heat conduction equation and considered the shape of the interface between solid and vapour to predict the ablated zone. 11 Chen et al analytically solved the 2D equation for repetitive laser pulses. 12 The problem with these analytical solutions is that a wide range of simplifying assumptions must be made to make the equation solvable.…”