LIBS at high duty-cycles: effect of repetition rate and temporal width on the excitation laser pulses

Laser-induced breakdown spectroscopy (LIBS) is becoming a more mature technology every year with new variants such as laser ablation molecular isotopic spectrometry, reheating by various discharge techniques, and multiple pulse excitation schemes, in which sometimes lasers of different lengths are used. However, inherent parameters like length repetition rate still almost exclusively employed. Recent years have witnessed the advent novel high-repetition-rate concepts for machining processes, welding, milling, engraving. Here, comprehensive study single-pulse LIBS spectra single aluminum target presented to showcase applicability flexible high duty-cycle master oscillator power amplifier (MOPA) lasers. Although traditional flashlamp-pumped Fabry–Pérot only permit variation energy operated at very low duty-cycles, MOPA add variable parameters. A thorough analysis temporal plasma behavior revealed emission dynamic closely match pattern. An sample’s spectral response was shown be significantly impacted variations both length. strength elemental lines Al, Sr, Ca all peaked slightly parameter settings, strongest impact found on relative abundance AlO bands. Unlike previous spectrometry (LAMIS) publications, latter could readily detected good intensity well-resolved features without any gating detector. This finding, together fact that inexpensive dependable, makes promising combination future studies including detection diatomic band structures.