Expansion of a multi-component laser-ablated plume

Expansion dynamics of laser ablated carbon plasma plume in helium ambient

Time resolved emission spectroscopic measurements on a plasma plume generated by pulsed laser ablation of carbon in helium ambient atmosphere have been performed. Temporal pro®les of electronically excited C2 species show a twin peak distribution beyond a threshold laser irradiance. The emission features of C2 species are found to be signi®cantly in ̄uenced by the ambient helium atmosphere. It i...

Plume Expansion and Ionization in a Micro Laser Plasma

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Multi-Wavelength Laser Opacity Study of a Hybrid Rocket Plume

An instrumentation system was developed to measure the opacity of a hybrid rocket plume as a function of optical wavelength. The source consisted of collineated beams from two lasers, providing seven wavelengths in a single probe beam. Detection was accomplished with a spectrograph equipped with a photodiode array. Previous work with a two-wavelength system demonstrated the ability to follow th...

Model for laser ablation plume expansion in gas

A simple model for laser ablation plasma plume expansion in a background gas is presented. The expanding plume is approximated by a semi-ellipsoidal shell of infinitesimal thickness and with a mass corresponding to the amount of background gas that has been snowploughed by the shell as it expands. Furthermore, the internal pressure of the plume and external pressure of the background gas are ta...

Optical modeling of laser ablated microstructures