scholarly journals Femtosecond Single-Pulse and Orthogonal Double-Pulse Laser-Induced Breakdown Spectroscopy (LIBS): Femtogram Mass Detection and Chemical Imaging with Micrometer Spatial Resolution

2021 ◽  
pp. 000370282110423
Author(s):  
Nikolaos Giannakaris ◽  
Anna Haider ◽  
Christoph M. Ahamer ◽  
Stefan Grünberger ◽  
Stefan Trautner ◽  
...  

Femtosecond laser-induced breakdown spectroscopy (fs-LIBS) is employed to detect tiny amounts of mass ablated from macroscopic specimens and to measure chemical images of microstructured samples with high spatial resolution. Frequency-doubled fs-pulses (length 400 fs, wavelength 520 nm) are tightly focused with a Schwarzschild microscope objective to ablate the sample surface. The optical emission of laser-induced plasma (LIP) is collected by the objective and measured with an echelle spectrometer equipped with an intensified charge-coupled device camera. A second fs-laser pulse (1040 nm) in orthogonal beam arrangement is reheating the LIP. The optimization of the experimental setup and measurement parameters enables us to record single-pulse fs-LIBS spectra of 5 nm thin metal layers with an ablated mass per pulse of 100 femtogram (fg) for Cu and 370 fg for Ag films. The orthogonal double-pulse fs-LIBS enhances the recorded emission line intensities (two to three times) and improves the contrast of chemical images in comparison to single-pulse measurements. The size of ablation craters (diameters as small as 1.5 µm) is not increased by the second laser pulse. The combination of minimally invasive sampling by a tightly focused low-energy fs-pulse and of strong enhancement of plasma emission by an orthogonal high-energy fs-pulse appears promising for future LIBS chemical imaging with high spatial resolution and with high spectrochemical sensitivity.

2010 ◽  
Vol 49 (13) ◽  
pp. C110 ◽  
Author(s):  
Michael E. Asgill ◽  
Michael S. Brown ◽  
Kyle Frische ◽  
William M. Roquemore ◽  
David W. Hahn

2005 ◽  
Vol 60 (11) ◽  
pp. 1392-1401 ◽  
Author(s):  
P.A. Benedetti ◽  
G. Cristoforetti ◽  
S. Legnaioli ◽  
V. Palleschi ◽  
L. Pardini ◽  
...  

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