The absorption and radiation of a tungsten plasma plume during nanosecond laser ablation

• DOI: 10.1063/1.4933214
• Publication Date: 2015-10-16T00:30:18Z
• Authors: T. Moscicki; J. Hoffman; J. Chrzanowska
• Keywords: Laser Ablation; Nanosecond; Shadowgraphy

In this paper, the effect of absorption laser beam and subsequent radiation on dynamics a tungsten plasma plume during pulsed ablation is analyzed. Different wavelengths are taken into consideration. The emission coefficients in pressure range 0.1–100 MPa temperature up to 70 000 K presented. shielding effects due may have an impact course ablation. numerical model that describes target heating formation its expansion were made for 355 nm 1064 Nd:YAG laser. with Gaussian profile was focused spot size 0.055 mm2 power density 1 × 109 W/cm2 (10 ns full width half maximum pulse duration). expands air at ambient mPa. use shorter wavelength causes faster target, thus higher rate. consequences rate slower smaller dimensions plume. case lower radiation. initial phase propagation plume, when both very high, dominant photo-recombination. However, after 100 expansion, spectral lines 46.5% total should not be neglected.