Optical emission spectroscopy characteristics of chromium plasma parameters

This study uses spectroscopic analysis Optical Emission Spectroscopy (OES) of chromium (Cr) plasma at atmospheric pressure. The researchers used a Q-switched Nd:YAG pulsed laser with a fundamental wavelength of 1064 nm, an energy range of 400–700 mJ, and a frequency of 6 Hz to generate the chromium plasma. They employed laser pulses ranging from 10 to 30 pulses. By analyzing the emitted light, they calculated various plasma parameters including electron temperature, electron density, Debye length, and plasma frequency. The results indicated that the emission spectrum of chromium plasma at 532 nm spanned from 180 to 1100 nm. At 1064 nm, the wavelength range of the chromium plasma extended from 170 to 1100 nm. These emission spectra allowed the determination of plasma parameters, with temperature being the most crucial one. The temperature of the chromium plasma increased as the laser energy was raised, ranging from 1.722–1.825 to 4.29–5.672 eV. The electron density in the chromium plasma also increase from 3.08 × 1018 to 3.90×1018 cm-3, while with the 1064 nm wavelength, it increased from 1.65 × 1018 to 4.05 × 1018 cm-3. Additionally, the researchers employed the optical transmission method along with an ultraviolet-visible spectrophotometer to ascertain the optical properties of chromium thin films. The measurements were carried out across a wavelength range spanning from 190 to 1100 nm.