Effects of parameters on spectrum characteristics of laser-induced glass plasma

The glass in the air is excited by a Nd: YAG nanosecond laser with wavelength 532 nm. The collection and photoelectric conversion of the plasma emission spectrum are realized by a high-resolution spectrometer and an ICCD. Si I (288.20 nm) and Ca II (393.37 nm) were used as analysis lines to study the effect of ICCD gate delay, ICCD gate width, distance from focus lens to sample surface (LTSD) on plasma signal intensity and signal-to-noise ratio. The optimized experimental parameters are determined:the ICCD gate is 1400 ns wide, the ICCD gate is delayed by 500 ns, and the LTSD is 84.5 mm. Under the optimized experimental conditions, the electron temperature and electron density of glass plasma are calculated by using six ion spectral lines of Ca II (315.89 nm, 317.93 nm, 370.60 nm, 373.69 nm, 393.37 nm, 396.85 nm) as analytical lines. The electron temperature and electron density of glass plasma are calculated at 20060 K and 8.256 × 10¹⁶ cm^-3, respectively. (authors)