High-speed diagnostics in laser material processing applications

Manfred Hugenschmidt; Ruediger Schmitt; Marion Althaus

doi:10.1117/12.273393

28 May 1997 High-speed diagnostics in laser material processing applications

Manfred Hugenschmidt, Ruediger Schmitt, Marion Althaus

Proceedings Volume 2869, 22nd International Congress on High-Speed Photography and Photonics; (1997) https://doi.org/10.1117/12.273393
Event: 22nd International Congress on High-Speed Photography and Photonics, 1996, Santa Fe, NM, United States

Abstract

Present investigations at ISL are concerned with studies of fundamental processes related to the interaction of high- power pulsed laser radiation with matter. Target effects of this type are becoming increasingly important both in fundamental research and in numerous industrial laser processing applications. Optical methods including laser diagnostics have proven to provide valuable tools for achieving the necessary high resolution information required for optimizational purposes in these transient effects. Investigations will be reported by using both single pulse and repetitively pulsed IR-laser radiation, covering a large range of fluences and fluxes, typically above the plasma ignition threshold of any type of solid or liquid target material. Fast experimental diagnostics have been set up and used, allowing the basic physical parameters of laser induced absorption wave plasmas, such as electron densities and temperatures to be determined. High temporal and spatial resolution was achieved in spectroscopic measurements, including the evaluation of plasma emission line intensity ratios and Stark broadening. For high-speed photographic visualizational purposes an optical set-up was used, including a frequency doubled repetitively pulsed Nd-laser, properly synchronized to the high-power laser induced target effects under investigation. This sampling technique has even been shown to be useful in repetitively pulsed target experiments for obtaining a quasi-stationary imaging of the video technique. With minor modifications the resulting optical information has been obtained by interferometric, schlieren or shadowgraphic methods. Subsequent image recording was achieved by the use of CCD-cameras, allowing both storage and further numerical processing. Examples of laser impact studies, especially in the case of effects, as induced by repetitively pulsed CO₂-laser radiation at average power densities above several to several tens of kW/cm² with peak power densities in the multi-MW/cm³ range, will be given and discussed.

Citation Download Citation

Manfred Hugenschmidt, Ruediger Schmitt, and Marion Althaus "High-speed diagnostics in laser material processing applications", Proc. SPIE 2869, 22nd International Congress on High-Speed Photography and Photonics, (28 May 1997); https://doi.org/10.1117/12.273393

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