Study of the morphology of a laser-produced aerosol plume by cavity ringdown laser absorption spectroscopy

Abstract

Cavity ring-down laser absorption spectroscopy (CRLAS) was applied for the first time to detection and characterization of laser breakdown generated aerosols. The method provided time-resolved morphological information on the aerosol plume, which is of importance in laser ablation (LA) and deposition, in laser-induced breakdown spectroscopy (LIBS) analysis, and in laser ablation inductively coupled plasma (LA-ICP) methods. This method provides sensitive detection of a variety of aerosols produced under ambient conditions. The morphological investigation revealed that the aerosol density has a reproducible pattern as a function of distance from the surface, although its details depend on time, on geometrical parameters and on the surface characteristics.

Measurement of aerosol optical extinction using diode laser cavity ringdown spectroscopy

“…(2), while the experimental values points are derived using the CRDS measurements and eq. (6). As shown in Figure 3, these two sets of extinction cross sections are in good agreement within 5% for aerosols ranging from 50 to 500 nm in diameter.…”

“…In particular, in situ measurements of the extinction and other optical parameters of atmospheric aerosols are crucial, and these require real-time, accurate, and sensitive techniques that can detect the ambient aerosols and their rapid temporal and spatial changes. Recent years have seen a rapid rise in the use of cavity ringdown spectroscopy (CRDS), a sensitive and direct optical extinction technique, to determine the optical properties of both laboratory generated and atmospheric ambient aerosols [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

“…Many more studies have been subsequently carried out to measure the optical extinction of aerosol particles using CRDS [6][7][8][9][10]. Most of these pervious works were based on using either a pulsed YAG laser, which is relatively bulky and limited to only 355, 532 or 1064 nm laser radiation [12][13][14], or a pulsed tunable dye laser, which is cumbersome and not suitable for field study [15].…”

Sources of Error and Uncertainty in the Use of Cavity Ring Down Spectroscopy to Measure Aerosol Optical Properties

“…A-CRDS is now routinely used in laboratory (Sappey et al 1998;Vander Wal and Ticich 1999;Smith and Atkinson 2001;Bulatov et al 2002Bulatov et al , 2003Bulatov et al , 2006Strawa et al 2003;Pettersson et al 2004;Baynard et al 2006;Garland et al 2007;Riziq et al 2007;Rudić et al 2007;Dinar et al 2008;Riziq et al 2008;Butler et al 2009;Freedman et al 2009;Khalizov et al 2009;Lang-Yona et al 2009Radney et al 2009;Xue et al 2009;Adler et al 2010;Hasenkopf et al 2010;Miles et al 2010aMiles et al , 2010b and field studies (Thompson et al 2002(Thompson et al , 2003Strawa et al 2006;Garland et al 2008;Nakayama et al 2010) to measure extinction by both aerosol ensembles (Vander Wal and Ticich 1999;Thompson et al 2002Thompson et al , 2003Thompson et al , 2008Strawa et al 2003;Pettersson et al 2004;Baynard et al 2006Baynard et al , 2007Garland et al 2007;Riziq et al 2007;Beaver et al 2008;…”

Novel optical techniques for measurements of light extinction, scattering and absorption by single aerosol particles

“…To date, CRDS has been used in both field [30,[34][35][36][37][38] and laboratory studies [13,31,[39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57], using both pulsed [13,30,36,37,[39][40][41][42]53,[58][59][60] and cw-laser [31,43,44,46,52] systems. Aerosol extinction at wavelengths ranging from the near UV [12,30] to the infrared [31,43,44,47] has been studied, with most measurements performed in the visible region.…”