Srovnávací studie laserové ablace vybraných pevných vzorků pmocí ns Nd:YAG, fs Yb-KGW a 46.9 nm XUV laseru

A Comparative Study of Laser-Ablation of Selected Targets by ns Nd:YAG, fs Yb-KGW and Capillary-Discharge Based XUV Lasers for Laser-Induced Breakdown Spectroscopy

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Laser-ablation (LA) is used in several analytical techniques such as Laser-Induced Breakdown Spectroscopy (LIBS) or laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). The most commonly used lasers for these applications are Nd:YAG with wavelengths ranging from 1064 nm down to 213 nm, or excimer lasers in the UV range. Laser irradiance, pulse duration, wavelength, and focal spot size are the most important parameters of laser that influence the laser ablation and hence the analysis of different samples. Extremely short-duration (fs) laser pulses can be used to create regular ablation craters without the crater rim formed by melted material typically in ns ablation. Lasers with shorter wavelengths can be convenient for creation of small-diameter ablation craters, which can be important e.g. for high-resolution mapping [1]. Here we report on the outcomes in a pilot study devoted to comparison of ablation crater formation on selected samples by 3 different laser sources. Yb-KGW laser with 1030 nm and pulse duration 350 fs [2], XUV laser emitting at 46.9 nm laser pulses with a duration of 1.7 ns [3] and commonly used Nd:YAG laser with fundamental wavelength 1064 nm and higher harmonics, and typical pulse duration of 4.5 ns were used to create craters into Cu, Fe, Zn, Sn, Pb, Si and brass sheets. The irradiance of the target with different lasers was kept constant, when it was possible. Different counts of pulses to observe the depth, shape and size of ablation craters were used. The feasibility of these LA sources for LIBS application will be discussed.

Práce pojednává o porovnání mechanismu ablace pevncýh vzorků pomocí laserů s různým trvání pulzu (ns, fs) a různých vlnových délek. Práce je z oblasti fundamentálních studií spektrometrie laserem indukovaného mikroplazmatu.

Laser-ablation (LA) is used in several analytical techniques such as Laser-Induced Breakdown Spectroscopy (LIBS) or laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). The most commonly used lasers for these applications are Nd:YAG with wavelengths ranging from 1064 nm down to 213 nm, or excimer lasers in the UV range. Laser irradiance, pulse duration, wavelength, and focal spot size are the most important parameters of laser that influence the laser ablation and hence the analysis of different samples. Extremely short-duration (fs) laser pulses can be used to create regular ablation craters without the crater rim formed by melted material typically in ns ablation. Lasers with shorter wavelengths can be convenient for creation of small-diameter ablation craters, which can be important e.g. for high-resolution mapping [1]. Here we report on the outcomes in a pilot study devoted to comparison of ablation crater formation on selected samples by 3 different laser sources. Yb-KGW laser with 1030 nm and pulse duration 350 fs [2], XUV laser emitting at 46.9 nm laser pulses with a duration of 1.7 ns [3] and commonly used Nd:YAG laser with fundamental wavelength 1064 nm and higher harmonics, and typical pulse duration of 4.5 ns were used to create craters into Cu, Fe, Zn, Sn, Pb, Si and brass sheets. The irradiance of the target with different lasers was kept constant, when it was possible. Different counts of pulses to observe the depth, shape and size of ablation craters were used. The feasibility of these LA sources for LIBS application will be discussed.

LIBS, ns, fs, XUV

11.09.2011

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