Micro-plasma is generated in ultra-high-pure hydrogen gas. which fills the inside of a cell at a pressure of (1. 08 ± 0. 033) × 105 Pa by using a Q-switched neodymium-doped yttrium-aluminum-garnet (Nd:YAG) laser device operated at a fundamental wavelength of 1064 nm and a pulse duration of 14 ns. https://stnicksknives.shop/product-category/keybar/