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LASER PROCESSING OF

MATERIALS

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Interaction between laser and

material Low power

reflected

refracted

scattered

diffracted

minimal ener! absorption " #non"contactin$%

&i' power " ener! s(fficient to

'eat

melt

e)aporate

b(rn

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Processes w'ic' (se lasers

C(ttin

*eldin

+rillin

S(rface treatment

Rapid protot!pin Microfabrication

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Rapid protot!pin ,RP- A famil! of prod(ction met'ods w'ic' 'a)e

de)eloped in t'e last ten !ears

Enable parts to be prod(ced from CA+

drawin wit' little or no operator inter)ention

CA+ model is con)erted to la!ers ,STL file- Most wor. b! addin material rat'er t'an

remo)in it

Se)eral (se lasers as part of t'e processin

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*'! (se lasers for processin/

&i' ener! densit!

Can be mo)ed abo(t )er! 0(ic.l! and

acc(ratel!

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Ener! densit! of a laser beam

+efined as t'e ener! incident on (nit

area

+etermined b! laser power and beam

si1e

Can increase b! foc(sin laser beam

Limited b! diffraction

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+iffraction limited spot si1e of

a laser beam Ass(me t'at t'e laser is appro2imatel!

plane3 and t'at it 'as a diameter of D4

It is foc(sed b! a lens of focal lent' f

Gi)e a spot si1e of dspot

spotd f =2.4 f

D

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SA5

A laser beam of wa)elent' 6748m and

diameter 9mm and power 6.* is foc(sed

b! a lens of focal lent' :7mm4 T'eintensit! of t'e foc(sed spot isa-

a-64: *;mm