Time-resolved line imaging optical emission spectroscopy of Zn and ZnO laser-induced plasmas in vacuo and in oxygen atmospheres

摘要

We present an overview and preliminary analysis of spatiospectrally resolved, nanosecond time-gated optical emission line images that we have recently collected of the Zn and ZnO laser ablation plumes produced under 532 nm irradiation at fluences of ≈ 7, 13, and 19 and 26 J cm~(-2), both in vacuo and in atmospheres of 10, 20, 50, 100, 250, 500, and 750 mTorr 100% O_2. The lower fluence and oxygen pressure regime is representative of PLD process conditions we have found conducive to the formation of high aspect ratio ZnO nanorods. Higher oxygen pressures and laser pulse energies result in the formation of a shock front exhibiting a large quantity of both structured and continuum optical emission.