Titlebook: Solid-State Lasers for Materials Processing; Fundamental Relation Reinhard Iffländer Book 2001 Springer-Verlag Berlin Heidelberg 2001 Laser

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https://doi.org/10.1007/978-3-540-46585-0Laser; basics; crystal; high power laser; laser diode; material processing; optics; solid state laser; solid

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Gaussian Opticsquality of the radiation field, particularly the intensity distribution, determines, next to the laser power, the field of laser applications. Therefore the laser beam must be characterized with respect to its optical qualities. In this chapter Gaussian optics is applied, which means:

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Thermal Effectsdation of the beam quality and fmally a fracture of the crystal. The heating therefore determines the beam quality and the maximal laser output power. The exact knowledge of the various heating mechanisms is therefore important and will be discussed in some detail.

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Material Processingities the heat is supplied to the workpiece so fast that losses due to heat conduction during welding and cutting are negligible. Nevertheless, the heat conduction is used for transformation hardening. Fig. 10.1 shows the laser cutting of a copper tube as an example.

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Laser Materialsen into account, for which laser activity has been proven for pulse or cw-operation at room temperature with an efficiency of about 1% lamp or diode with excitation and which are commercially available. Further details are provided in the subsequent chapters.

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Beam SourceThe principle setup of a pulsed solid state laser for material processing is shown in the following block diagram (Fig. 5.1). The setups for cw, pulsed or Q-switched operations are similar.

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OpticsThe focus diameter, the working distance, the divergence and the beam diameter are predefmed by the application problem and the beam source used. With that, the necessary optics can be completely calculated.