Laser ablation rate of materials using the generated acoustic waves

Efthimiopoulos, T.; Kritsotakis, Evangelos I.; Kiagias, H.; Savvakis, C; Bertachas, Y

doi:10.1088/0022-3727/31/19/039

Cited by 15 publications

(7 citation statements)

References 23 publications

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“…The ablation rate can be roughly estimated from the optical microscope images and profileometer scans obtained in several sections across the damage area. The ablation rate is dependent on many factors that include the laser parameters, surface conditions, and laser absorption in the plasma [51]. For a laser fluence of 48 J/cm 2 , a rough estimate on the ablation rate is¨0.5 Ag/pulse, while it was¨5 times less for a fluence of 4 J/cm 2 .…”

Section: Sample Ablationmentioning

confidence: 99%

Spark discharge assisted laser induced breakdown spectroscopy

Nassef

Elsayed-Ali

2005

Spectrochimica Acta Part B: Atomic Spectroscopy

136

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Section: Sample Ablationmentioning

confidence: 99%

Spark discharge assisted laser induced breakdown spectroscopy

Nassef

Elsayed-Ali

2005

Spectrochimica Acta Part B: Atomic Spectroscopy

136

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“…To obtain more insight into the process as a function of the ablation laser fluence, we also monitor the generated AW due to the interaction of the laser pulses with the Cu disc. We implement the AW measurements since proper calibration of the peak-to-peak amplitude allows determining the ablation rate in real-time. ,, Figure B shows a representative AW generated for five laser pulses impacting the disc at a 17.4 J/cm 2 fluence. The peak amplitudes are almost equal in this range, continuing to be so for many pulses and accordingly indicating a similar ablation mechanism for each laser pulse.…”

Section: Resultsmentioning

confidence: 99%

Pulsed Laser Ablation at Gas/Liquid/Solid Interfaces Controlled via Rotation of a Partially Submerged Disc

Monsa

Lerner²,

Danon³

et al. 2021

J. Phys. Chem. C

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The increasing interest in various nanoparticles (NPs) with well-defined properties requires their convenient and efficient production. Here, we exploit a new proposed scheme for pulsed laser ablation in liquid (PLAL), where nanosecond laser pulses process a 45° tilted, rotating copper (Cu) disc, partially submerged into ethanol. This disc rotation spreads a thin ethanol layer on its surface. The generated plasma, formed following the laser impact, led to film splashing and caused NP accumulation in the ethanol pool. Analysis of fast camera frames and measured acoustic-wave (AW) amplitudes suggest mechanistic insight and allow optimizing the parameters. The laser fluence, ablation time, and particularly the rotating target speed, controlling the layer thickness, are varied to determine their effect on the ablation products. The observed dependence of the measured AW amplitudes, surface plasmon resonance intensities, and power-specific productivities on laser fluence match the calculation results, accounting for the effective laser energies generating the plasma. This promising technique enables the continuous synthesis of crystalline Cu NPs with high efficiency and concentration, providing a basis for further optimization of solid target ablation toward the achievement of specific particles for various applications.

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“…In this ablative domain, easily obtained from a pulsed laser in the focus of a lens, when the solid is subjected to thermal and/or mechanical changes, the pattern of sound generation may become complex since nonlinear acoustic emissions arise due to the sudden release of thermal energy [ 37 , 38 , 39 , 40 ]. In any case, these laser-generated acoustic transients have become a promising tool for monitoring and control the ablation process from fundamental properties like the stress power (laser energy coupling to the solid target) [ 41 ], the plasma formation mechanism and its evolution dynamics [ 42 , 43 ] and the ablation rate [ 44 , 45 , 46 ], as well as for standardizing the retrieved analytical signal via normalization of optical emissions [ 47 , 48 ].…”

Section: Introductionmentioning

confidence: 99%

Remotely Exploring Deeper-Into-Matter by Non-Contact Detection of Audible Transients Excited by Laser Radiation

Moros

Gaona

Laserna

2017

Sensors

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An acoustic spectroscopic approach to detect contents within different packaging, with substantially wider applicability than other currently available subsurface spectroscopies, is presented. A frequency-doubled Nd:YAG (neodymium-doped yttrium aluminum garnet) pulsed laser (13 ns pulse length) operated at 1 Hz was used to generate the sound field of a two-component system at a distance of 50 cm. The acoustic emission was captured using a unidirectional microphone and analyzed in the frequency domain. The focused laser pulse hitting the system, with intensity above that necessary to ablate the irradiated surface, transferred an impulsive force which led the structure to vibrate. Acoustic airborne transients were directly radiated by the vibrating elastic structure of the outer component that excited the surrounding air in contact with. However, under boundary conditions, sound field is modulated by the inner component that modified the dynamical integrity of the system. Thus, the resulting frequency spectra are useful indicators of the concealed content that influences the contributions originating from the wall of the container. High-quality acoustic spectra could be recorded from a gas (air), liquid (water), and solid (sand) placed inside opaque chemical-resistant polypropylene and stainless steel sample containers. Discussion about effects of laser excitation energy and sampling position on the acoustic emission events is reported. Acoustic spectroscopy may complement the other subsurface alternative spectroscopies, severely limited by their inherent optical requirements for numerous detection scenarios.

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Laser ablation rate of materials using the generated acoustic waves

Cited by 15 publications

References 23 publications

Spark discharge assisted laser induced breakdown spectroscopy

Spark discharge assisted laser induced breakdown spectroscopy

Pulsed Laser Ablation at Gas/Liquid/Solid Interfaces Controlled via Rotation of a Partially Submerged Disc

Remotely Exploring Deeper-Into-Matter by Non-Contact Detection of Audible Transients Excited by Laser Radiation

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