Abstract

A spatially and temporally resolved transient absorption technique has been employed to investigate the dynamics of ground-state YO during 355 nm laser ablation of Y2O3. Time-of-flight (TOF) mea- surements of the expanding YO plume in vacuum and in Ar or O2 ambient are reported. During the initial expansion of YO in vacuum, the center-of-mass velocity and the expansion velocity increase with distance up to the boundary of the Knudsen layer. In the presence of oxygen, reactions of the ablated atomic species with oxygen take place, resulting in the formation of YO with broad velocity distribution. From the peak time of the observed TOF distributions, the most probable velocities of YO are found to be 2.6 km/s in vacuum, 2.2 km/s in 50 mTorr Ar, and 1.8 km/s in 50 mTorr O2, respectively. The dependence of the peak time on distance shows that the experimental data can be well fitted with a shock wave model at higher ambient gas pressure.

Time-resolved imaging and optical spectroscopy of plasma plumes during pulsed laser material deposition

Rosario C. Sausa
Appl. Opt. 56(3) B123-B133 (2017)

Dynamics of laser-ablated carbon plasma: formation of C₂ and CN

Archana Kushwaha and R. K. Thareja
Appl. Opt. 47(31) G65-G71 (2008)

Plasma plumes produced by laser ablation of Al with single and double pulse schemes

N. Smijesh, Kavya H. Rao, D. Chetty, I. V. Litvinyuk, and R. T. Sang
Opt. Lett. 43(24) 6081-6084 (2018)

High-resolution spectroscopy of laser ablation plumes using laser-induced fluorescence

S. S. Harilal, N. L. LaHaye, and M. C. Phillips
Opt. Express 25(3) 2312-2326 (2017)

Morphological changes in ultrafast laser ablation plumes with varying spot size

S. S. Harilal, P. K. Diwakar, M. P. Polek, and M. C. Phillips
Opt. Express 23(12) 15608-15615 (2015)