Characterization of laser-induced plasmas for fiber optic probes

Dimitra N. Stratis; Kristine L. Eland; S. Michael Angel

doi:10.1117/12.339049

10 February 1999 Characterization of laser-induced plasmas for fiber optic probes

Dimitra N. Stratis, Kristine L. Eland, S. Michael Angel

Proceedings Volume 3534, Environmental Monitoring and Remediation Technologies; (1999) https://doi.org/10.1117/12.339049
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States

Abstract

We recently developed a number of fiber-optic probe designs for remote elemental analyses using laser-induced breakdown spectroscopy (LIBS). The LIBS process is complicated by non- linear ablation and excitation of the sample which hinders the reproducibility of the technique. We are conducting dual-pulse LIBS laser studies to separately investigate the ablation and excitation steps. Signal enhancements as high as five-fold are observed using dual-laser pulses over conventional LIBS. The enhancement is very dependent on the timing between the two laser pulses. It also appears that the sample matrix influences the degree of enhancement observed. Factors affecting the LIBS signal are also being investigated using a time-resolved imaging setup which consists of an acousto-optic tunable filter (AOTF) along with a gated intensified charge- coupled device (ICCD) detector. Using simple imaging techniques, we have found for certain samples that the emission intensity increases and the overall shape of the plasma changes with increasing number of laser shots. The size and shape of the plume appears to be related to the geometry and depth of the crater that is formed in the sample. It is hoped that the results of these studies will be useful in making better fiber-optic LIBS measurements.

Citation Download Citation

Dimitra N. Stratis, Kristine L. Eland, and S. Michael Angel "Characterization of laser-induced plasmas for fiber optic probes", Proc. SPIE 3534, Environmental Monitoring and Remediation Technologies, (10 February 1999); https://doi.org/10.1117/12.339049

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