Oxygen isotope ratio analysis of silicate and oxide minerals by UV ablation with a frequency-doubled copper vapour laser

E. D. Young*, A. J. Andrews, D. W. Coutts

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

1 Citation (Scopus)

Abstract

Frequency doubling of a copper vapour laser produces high-repetition rate UV output suitable for mineral ablation and fluorination. An Oxford Lasers copper vapour laser (LS 10-10, nominally 10W average power) operating at 4 kHz pulse repetition rate was used in the experiments. The laser was configured with a high magnification off-axis unstable resonator (M = 64) and frequency doubled in BBO using a line focus as described to yield average powers in the UV of up to 400 mW. The UV is focused to a 25 micron spot on the mineral sample via a turning prism placed within the blind spot of a binocular microscope, enabling coaxial viewing of ablation through the BaF 2 window of the sample chamber. Silicate threshold fluences of 5 to 15 J/cm 2 are easily obtained with this system. The high repetition rate of the copper vapour UV source permits ablation times on the order of 1 to 2 seconds, yielding background levels of O 2 on the order of 0.4 × 10 -9 moles. During ablation the beam is restored to produce an ablation pit measuring approximately 100 × 100 × 30 microns and approximately 15 × 10 -9 moles of O 2. Movement of the laser beam enhances the size of the plasma plume and promotes fluorination. Potential applications of this new UV-laser based technology range from meteoritics to biogeochemistry.

Original languageEnglish
Title of host publicationProceedings of European Meeting on Lasers and Electro-Optics
Place of PublicationPiscataway, N.J.
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages199
Number of pages1
ISBN (Electronic)0780331702
ISBN (Print)0780331699
DOIs
Publication statusPublished - Sep 1996
Externally publishedYes
EventProceedings of the 1996 Conference on Lasers and Electro-Optics Europe, CLEO/Europe - Hamburg, Ger
Duration: 8 Sep 199613 Sep 1996

Other

OtherProceedings of the 1996 Conference on Lasers and Electro-Optics Europe, CLEO/Europe
CityHamburg, Ger
Period8/09/9613/09/96

Fingerprint Dive into the research topics of 'Oxygen isotope ratio analysis of silicate and oxide minerals by UV ablation with a frequency-doubled copper vapour laser'. Together they form a unique fingerprint.

Cite this