Influence of sample temperature on the expansion dynamics of laser-induced germanium plasma

Abstract

In this paper, we investigated the influence of sample temperature on the expansion dynamics and the optical emission spectroscopy of laser-induced plasma, and Ge was selected as the test sample. The target was heated from room temperature (22 °C) to 300 °C, and excited in atmospheric environment by using a Q-Switched Nd:YAG pulse laser with the wavelength of 1064 nm. To study the plasma expansion dynamics, we observed the plasma plume at different laser energies (5.0, 7.4 and 9.4 mJ) and different sample temperatures by using time-resolved image. We found that the heated target temperature could accelerate the expansion of plasma plume. Moreover, we also measured the effect of target temperature on the optical emission spectroscopy and signal-to-noise ratio.

Investigation into the Effect of Increasing Target Temperature and the Size of Cavity Confinements on Laser-Induced Plasmas

“…The decrease in the air density resulted in a decrease in the radiation process and lower collision probability. Furthermore, as the plasma expands, the plasma pressure also decreases [40][41][42][43]. From Figure 7 we observed that the higher sample temperature lead to a substantial change in the plasma dynamics.…”

Effect of liquid aerosol temperature on the detection performance of LIBS for analysis of phosphorus element in water

“…In addition, the sample temperature has a signicant effect on the laser ablation crater (mass and volume) and rate, [18][19][20][21][22][23] signal intensity, 24 signal-to-noise ratio (SNR), 25 plasma properties (dynamic, morphology, temperature, and electron density), 18,21,[26][27][28][29][30][31][32][33] experimental conditions (defocusing amount, laser energy, and delay time), [34][35][36][37] self-absorption, 38 and detection performance (repeatability, accuracy, and sensitivity) 27,[39][40][41][42] of LIBS. These have been veried on a solid sample (e.g.…”

“…These have been veried on a solid sample (e.g. aluminum, aluminum alloy, steel, iron, slag, glass, silicon, soil, rock, gold, copper, brass, copperzinc alloy, molybdenum-tungsten alloy, magnesium, germanium, titanium, inconel superalloys, nickel, tissue, and particles), 19,20,22,23,[25][26][27][28][29][30][31][32][33][34]36,[41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] gas sample, 39 and liquid sample (water, molten metals, and molten salts) 60-65 by many researchers. For example, increasing the sample temperature results in a larger mass and volume of the laser ablation crater, stronger signal intensity and SNR, higher plasma temperature and electron density, and improved detection performance.…”

Influence of distance from lens to sample surface on spectral sensitivity of femtosecond laser-induced breakdown spectroscopy with NaCl water film

“…Enhanced laser-induced plasma emission intensity is the main way to make up for these disadvantages of LIBS technology. Based on solid samples, researchers believe that many methods, including double-pulse [19], spatial confinement [20][21][22], magnetic confinement [23], spark discharge enhancement [24][25][26][27], increasing sample temperature [28][29][30][31], changing the distance from lens to sample surface (DFLS) [32][33][34], can improve the stability and analytical sensitivity of liquid samples. Among them, the doublepulse method is frequently applied to the detection of liquid samples.…”