Download Solid-State Lasers for Materials Processing: Fundamental by Reinhard Iffländer PDF

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  • April 20, 2017
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By Reinhard Iffländer

This booklet explains intimately the technical and actual simple ideas of solid-state lasers for cloth processing. The attribute parameters of laser beams, resembling beam caliber, strength and potency, are concerning parameters of useful use. traditional functions of excessive strength lasers, similar to laser welding, slicing and scribing, in addition to the fundamentals of laser-matter interactions, also are mentioned within the publication. the kinds of lasers thought of contain: excessive strength Nd, Yb:YAG, Nd-glass lamp- or laserdiode-pumped. facts on capability fabrics for solid-state lasers reminiscent of alexandrite, GGG, YVO, YLF and others are awarded. Aspectys of laser gadget layout, for instance, beam optics and beam guiding by means of fiber, are mentioned. Many tables and images make this an invaluable guide for scientists, technique engineers, laser physicists and complex students.

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13). Two intensity distributions with (sin218 + cos 21t5) = 1 can be superimposed to give rotational-symmetric distributions, so-ca lIed Donut modes, with a zero in the center, Fig. 6. Jp,l The distribution is characterized by an azimuthal structure (Fig. 7). p,l = 0,1 p,/=0,2 p,l = 0,3 p,l= 0,4 •• Fig. 7. e. circular-(rod) or rectangular geometry (slab) and by the transverse gain structure. 7 only apply to an empty resonator. 8). 0 +-~-":-:--T-~'----""""--' - 3 -2 -1 0 2 3 TEM-l0 beam radius rlwT Fig.

On the right side a two-dimensional contour plot of the intensity is shown. Circular Symmetry ! /""'\. o -3 -2 p,l = 2,0 ~ "0""- ""'4" -1 o • i • Fig. 5. a) = 1, L~I) (il) = 1+ 1 - n, 1= azimuthai mode order, i5 = azimuthai angle, L~) (il) =(1 + 1)(1 + 2)/2 - (I + 2)n+ n 2/2, p = radial mode order, f( 0) = sin21i5, cos 2lo. e. 15) Le. a Gaussian beam with a beam radius Wo at the position z = O. 1 = 0 and f(O) = 1 In Fig. 5 the intensity distribution for a circular symrnetry for low-order modes is shown.

Optical feedback into the lamp through selectively coated flow tubes around the lamps recyc1es the energy outside the absorption levels. The reflector has to be adapted as c10sely as possible to the laser medium and the lamps. The pump light should not see any "gaps", by which it may escape. Boundary surfaces (flow tube of the rod) must be antireflective-coated. The wall material ofthe lamp should be absorption-free. Water has a strong absorption at a wavelength of 700 nm, increasing with wavelength.

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