Effect of pulse repetition rate on erbium laser ablation of soft and hard tissues

To investigate the influence of pulse repetition rate on the average size of the nanoparticles, nanocrystalline Si films were prepared by pulsed laser ablation in high-purity Ar gas with a pressure of 10 Pa at room temperature, under the pulse repetition rates between 1 and 40 Hz, using a nanosecond laser. Raman, X-ray diffraction spectra, and scanning electron microscopy images show that with increasing pulse repetition rate, the average size of the nanoparticles in the film first decreases and reach its minimum at 20 Hz, and then increases, which may be attributed to the nonlinear dynamics of the laser-ablative deposition. In our experiment conditions, the duration of the ambient restoration, a characteristic parameter being used to distinguish nonlinear or linear region, is about a few seconds from the order of magnitude, which is consistent with the previous experimental observation. More detailed model to explain quantitively the observed effect is under investigation.

Download Full-text

Elemental analysis of copper alloys with laser-ablation spark-induced breakdown spectroscopy based on a fiber laser operated at 30 kHz pulse repetition rate

Journal of Analytical Atomic Spectrometry ◽

10.1039/c9ja00169g ◽

2019 ◽

Vol 34 (9) ◽

pp. 1838-1845 ◽

Cited By ~ 7

Author(s):

Yinhua Jiang ◽

Runhua Li ◽

Yuqi Chen

Keyword(s):

Laser Ablation ◽

Fiber Laser ◽

Elemental Analysis ◽

Repetition Rate ◽

Pulse Repetition Rate ◽

Copper Alloys ◽

Spark Discharge ◽

Pulse Repetition ◽

Analytical Sensitivity ◽

Breakdown Spectroscopy

The analytical sensitivity of a compact LIBS system consisting of a fiber laser and a fiber spectrometer was successfully improved by the spark discharge.

Download Full-text

Correlation between oxygen consumption and photobleaching during in vitro photodynamic treatment with ATX-S10·Na(II) using pulsed light excitation: Dependence of pulse repetition rate and irradiation time

Photochemistry and Photobiology ◽

10.1562/2004-03-27-ra-125 ◽

2004 ◽

Author(s):

Satoko Kawauchi ◽

Shunichi Sato ◽

Yuji Morimoto ◽

Makoto Kikuchi

Keyword(s):

Oxygen Consumption ◽

Repetition Rate ◽

Pulse Repetition Rate ◽

Irradiation Time ◽

Pulse Repetition ◽

Pulsed Light ◽

Photodynamic Treatment ◽

Light Excitation

Download Full-text

Two Approaches to the Laser-Induced Formation of Au/Ag Bimetallic Nanoparticles in Supercritical Carbon Dioxide

Nanomaterials ◽

10.3390/nano11061553 ◽

2021 ◽

Vol 11 (6) ◽

pp. 1553

Author(s):

Alexey Rybaltovsky ◽

Evgeniy Epifanov ◽

Dmitriy Khmelenin ◽

Andrey Shubny ◽

Yuriy Zavorotny ◽

...

Keyword(s):

Carbon Dioxide ◽

Supercritical Carbon Dioxide ◽

Ag Nanoparticles ◽

Repetition Rate ◽

Pulse Repetition Rate ◽

Bimetallic Nanoparticles ◽

Side Wall ◽

Pulse Repetition ◽

Gold Core ◽

Supercritical Carbon

Two approaches are proposed for the synthesis of bimetallic Au/Ag nanoparticles, using the pulsed laser ablation of a target consisting of gold and silver plates in a medium of supercritical carbon dioxide. The differences between the two approaches related to the field of “green chemistry” are in the use of different geometric configurations and different laser sources when carrying out the experiments. In the first configuration, the Ag and Au targets are placed side-by-side vertically on the side wall of a high-pressure reactor and the ablation of the target plates occurs alternately with a stationary “wide” horizontal beam with a laser pulse repetition rate of 50 Hz. In the second configuration, the targets are placed horizontally at the bottom of a reactor and the ablation of their parts is carried out by scanning from above with a vertical “narrow” laser beam with a pulse repetition rate of 60 kHz. The possibility of obtaining Ag/Au alloy nanoparticles is demonstrated using the first configuration, while the possibility of obtaining “core–shell” bimetallic Au/Ag nanoparticles with a gold core and a silver shell is demonstrated using the second configuration. A simple model is proposed to explain the obtained results.

Download Full-text