Abstract

The long pulse ablation of aluminum wafers in ambient air using an Er:YAG laser at 2.94 μm wavelength is presented. Visible emission spectra collected during ablation are assigned to the B2Σ+X2Σ+ molecular electronic transition of aluminum monoxide (AlO). A rovibronic model including self-absorption within the plume is developed to determine the molecular temperature. For a 60.2 μs pulse at a fluence of 249.92±40J/cm2, a temperature of 2843±32K and 3013±30K was found with the linear and nonlinear models, respectively. A greybody background with an emissivity of approximately 1.3×106 was observed, implying a low-volume mixing fraction of particulates in the plume. A linear fit of the Δv=1 sequence was developed to rapidly analyze hundreds of spectra taken as background pressure was varied from 400 to 1000 mbar. The AlO temperature is approximately independent of background pressure. Finally, comparisons to other laser ablation studies at shorter wavelengths and shorter pulse durations are made wherever possible.

© 2018 Optical Society of America

Full Article  |  PDF Article
More Like This
Laser ablated Ti velocity distribution dynamics

William Bauer and Glen Perram
J. Opt. Soc. Am. B 35(10) B27-B37 (2018)

Spectroscopic temperature determination of aluminum monoxide in laser ablation with 266-nm radiation

I. G. Dors, C. Parigger, and J. W. L. Lewis
Opt. Lett. 23(22) 1778-1780 (1998)

Elucidating uranium monoxide spectral features from a laser-produced plasma

Sivanandan S. Harilal, Brian E. Brumfield, Nick Glumac, and Mark C. Phillips
Opt. Express 26(16) 20319-20330 (2018)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (11)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (2)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (12)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Metrics