Tungsten ion source under double-pulse laser ablation system
Khalil Ahmed Asaad I1, †, Hafez Ashraf I2, Elgohary Mahmoud E3, 4, Morsy Mohamed A5
       

(color online) Variations of the DP-LIBS signal intensity of W(I) 361.75 nm line with laser pulse energy ratio E2 (1064 nm)/E1 (266 nm) by focusing the DP-lasers at various distances relative to the W surface (d = −2.5 mm, −1 mm in front of the surface, 0, 3 mm, and 4 mm behind the surface).