Holographic imaging of laser penetration processing in transparent media: visualizing the temperature field in real time

M. Olfert; Walter W. Duley

doi:10.1117/12.237720

8 April 1996 Holographic imaging of laser penetration processing in transparent media: visualizing the temperature field in real time

M. Olfert, Walter W. Duley

Author Affiliations +

Proceedings Volume 2703, Lasers as Tools for Manufacturing of Durable Goods and Microelectronics; (1996) https://doi.org/10.1117/12.237720
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

Many of the phenomena which occur in penetration processing of metals are mirrored in non- metallic systems. Imaging of the penetration processing transverse to the beam incidence has proved to yield insights into the dynamic behavior of the laser induced cavity (keyhole). In this paper we report on the use of an imaging technique known as real time differential holographic interferometry which effectively allows direct visualization of the thermal variation within a transparent medium undergoing laser processing. Differences in heated fluid flow patterns induced by laser drilling of a glycerol-water mixture under varying gravity conditions are presented to demonstrate an immediate application of the holographic technique. By imaging processes which possess cylindrical symmetry, the holographic imaging data can be reduced to temperature field data in a straightforward manner, which proves to be valuable for comparison with thermal modeling of the process. Experiments involving drilling of fused quartz will be discussed and the experimental temperature field data will be compared with a simple numerical model.

Citation Download Citation

M. Olfert and Walter W. Duley "Holographic imaging of laser penetration processing in transparent media: visualizing the temperature field in real time", Proc. SPIE 2703, Lasers as Tools for Manufacturing of Durable Goods and Microelectronics, (8 April 1996); https://doi.org/10.1117/12.237720

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