Pulsed ablation of carbon/graphite surfaces and development of plume-kinetics model

C. Dean Roberts; Michael A. Marciniak; Glen P. Perram

doi:10.1117/12.899255

28 November 2011 Pulsed ablation of carbon/graphite surfaces and development of plume-kinetics model

C. Dean Roberts, Michael A. Marciniak, Glen P. Perram

Proceedings Volume 8190, Laser-Induced Damage in Optical Materials: 2011; 81901F (2011) https://doi.org/10.1117/12.899255
Event: SPIE Laser Damage, 2011, Boulder, Colorado, United States

Abstract

Plumes were generated by ablation of graphite using a 248 nm excimer laser in the presence of low-pressure argon at 50-1000 mTorr. The pulsed laser deposition of energy on carbon/graphite targets at fluences of 1-5 J/cm² in low pressure argon backgrounds yields emissive plumes with large kinetic energies (estimated between 10-200 eV ), driving the formation of a shock front with large Mach numbers (M). The plumes were investigated using element specific imaging (filtered and gated ICCD camera), time-of-flight experiments, and UV - VIS - IR spectroscopy. We expect to see contributions from atomic carbon as well as the C2 diatomic. Studies showed the importance of plume/substrate interaction in causing secondary excitation/interaction phenomena. The propagation of the shock front is independent of ionization species and adequately characterized by the Sedov-Taylor shock model during the early life-time of the plume if the dimensionality is allowed to deviate from ideal spherical expansion. The ideal efficiency of energy conversion from laser pulse to shock expansion is investigated. The low background pressures between 50 and 1000 mTorr are sufficient for the generation of a strong shock front with significant thickness, but may be too low to develop three-dimensional flow. It can be shown that shock strength is proportional to the Mach number.

Citation Download Citation

C. Dean Roberts, Michael A. Marciniak, and Glen P. Perram "Pulsed ablation of carbon/graphite surfaces and development of plume-kinetics model", Proc. SPIE 8190, Laser-Induced Damage in Optical Materials: 2011, 81901F (28 November 2011); https://doi.org/10.1117/12.899255

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available