Ablation plume structure and dynamics in ambient gas observed by laser-induced fluorescence imaging spectroscopy

Impact of oxygen chemistry on the emission and fluorescence spectroscopy of laser ablation plumes

“…Most of the previous studies on LIF of LA plumes used a pulsed laser as an excitation source [16,19,22,31]. In the present study, we used a cw laser as a LIF excitation source which provides unique advantages, such as higher spectral resolution, constant re-excitation during the entire lifecycle of the plume, and simpler parametric optimization (no inter-pulse delay, for example).…”

“…Among the various optical spectroscopic techniques (emission, absorption, and fluorescence), LIF and laser absorption spectroscopy (LAS) provide improved selectivity, sensitivity, and spectral resolution compared to traditional emission-based methods [12][13][14][15][16][17][18][19]. Hence LIF of LA plumes is capable of addressing some of the limitations in the figures of merit for LIBS measurements (precision, detection limits, line broadening, isotopic analysis, etc.)…”

“…The excitation spectrum, emission spectrum, and fluorescence lifetime or decay rates are the most common parameters of fluorescence spectroscopy for probing and sensing. Most of the previous studies related to LIF of LA plumes were performed using pulsed lasers that only provide a fixed wavelength resonance excitation [16,22,23]. Pulsed laser excitation is typically delayed for some time after the initial LA pulse and will lead to preferential excitation of the lower energy state population at a specific time in the plasma evolution; however, it is possible for LIF signal saturation to occur due to depletion of the lower energy state atoms [24].…”

A Review of Underwater Laser-induced Breakdown Spectroscopy of Submerged Solids

“…[119][120][121] Laser-induced fluorescence (LIF) of the plasma with fast imaging also gives information of the spatial distribution of the specific species. 122 In the case of laser ablation plasma in water, De Giacomo et al have performed…”

Time-resolved quantification of plasma accumulation induced by multi-pulse laser ablation using self-mixing interferometry

“…Several techniques have been used to study and quantify the laser-induced plumes. Among them, imaging * methods allow for a direct observation of the plume evolution through the detection of plasma emission [18][19][20][21], as well as shadowgraphy, fluorescence imaging or schlieren photography exploiting probe radiation across the ejected particles and vapors [22][23][24][25][26]. Although highspeed cameras allow for good temporal and spatial resolutions, they essentially give only qualitative information about plume concentration.…”