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  • Print publication year: 2006
  • Online publication date: August 2009

14 - High-speed, high-resolution LIBS using diode-pumped solid-state lasers



Most of the investigations and applications of LIBS use laser sources operating at repetition frequencies in the range of 10–20 Hz, yielding laser pulse energies of typically 50–300 mJ. This is a consequence of the broad commercial availability of Q-switched flashlamp-pumped solid-state lasers. The most important laser type is the Nd:YAG laser with an emission wavelength in the near infrared at 1064 nm. Such lasers are reliable radiation sources for a variety of research topics and industrial applications. The dominant industrial application field is laser material processing, for example marking, drilling, cutting and cleaning. The first industrial applications of LIBS have also been realized on the basis of flashlamp-pumped Nd:YAG lasers [1–4].

The prevailing task for LIBS with repetition frequencies between 10 and 20 Hz is bulk analysis of materials. A few papers deal with spatially resolved measurements [5–8]. A relative motion between the focused laser beam and the sample enables a scanning across the surface. The spectral information gained is linked to the location of irradiation of the laser pulse onto the sample surface. The result is presented, for example, as an element line intensity of the laser-induced plasma versus one or two spatial coordinates. The latter situation yields maps of element-specific intensities of a sample surface. However, a mapping with a step size of 20 μm by scanning of an area of 1 cm2 of a sample requires 250 000 single measurements.

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