Abstract
In this work we will represent the necessary calculation for the optical setup on a LIBS spectroscopic system, as well as the parameters for the beam characterization. On the realized simulation, the beam was deal with the wave optics theory and its propagation with the paraxial approximation. It was described as a beam of Gaussian intensity profile and its propagation was acquired through the ABCD’s law. Our results have showed the necessary lens to hold a LIBS sign for different kinds of materials, depending on their bond cleavage . Also, we have showed a table with typical values of focus lens, used in LIBS setups, and its respective irradiance.
Highlights
The LIBS (Laser Induced Breakdown Spectroscopy) system is widely used in several research fields for atomic analysis of many materials, including alloys, soils, fertilizers, grains, architectonic objects, semiconductors and medicines, among others [1,2,3,4,5,6,7]
In 2011, a LIBS system was coupled to the Curiosity robot and it was sent to Mars, showing its maturity and utility [8,9]
In this work we present the calculation achieved for an optical LIBS system setup supposing the Gaussian profile of the laser beam
Summary
The LIBS (Laser Induced Breakdown Spectroscopy) system is widely used in several research fields for atomic analysis of many materials, including alloys, soils, fertilizers, grains, architectonic objects, semiconductors and medicines, among others [1,2,3,4,5,6,7]. To find the beam ray w(z), the waist w0 and the curvature ray of the wavefront R(z) as the beam propagates and interacts with the optical elements (mirrors and lens), we need to apply the ABCD’s law, widely used in geometric optics and that, with the correct construction of parameters which describe the beam, can be utilized in the Gaussian wave [17] To do so, it is defined the parameter q(z), given by eq (4), which is a complex number. For sample matrixes utilized in LIBS spectroscopy, bond cleavage following material ablation happened in the range of 5 to 10 GW/cm2 In this case, we can overcome this value with the initial use of a lens with focusing distance of to 20 cm.
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