Repetitively pulsed plasma-enhanced laser-target energy transfer processes

Manfred Hugenschmidt

doi:10.1117/12.350511

22 June 1999 Repetitively pulsed plasma-enhanced laser-target energy transfer processes

Manfred Hugenschmidt

Proceedings Volume 3516, 23rd International Congress on High-Speed Photography and Photonics; (1999) https://doi.org/10.1117/12.350511
Event: Twenty-Third International Congress on High-Speed Photography and Photonics, 1998, Moscow, Russian Federation

Abstract

Main emphasis of the laser-target effect investigations to be reported in the present paper was related to characterize and to improve methods for enhancing the energy transfer rates by thermal conduction, radiation, recombination or recondensation. It was especially aimed to study the behavior of optically transparent dielectrical materials, subject to temporally strongly modulated high average power laser radiation. Experimental studies were carried out on samples either transparent in the visible or in the infrared spectral range. A large range of laser irradiation conditions was provided by a novel repetitively pulsed CO₂-laser. This laser provides average powers up to 15 kW. Pulse energies up to 150 J per pulse and peak powers close to hundred MW (for typical pulse durations of 2 microseconds to 10 microseconds) are achieved at any repetition rate up to 100 pps. Rather uniform power densities (with peak to average values ratios of 10³ to 10⁴) were established across large area surfaces quasi-one-dimensionally. Focusing conditions were adapted to specific experimental requirements. High speed photographic diagnostics including high speed videography, laser interferometry and laser moire techniques have been used and compared to provide information on thermal and thermomechanical plasma-induced processes, on damage thresholds and on basic physical mechanisms involved.

Citation Download Citation

Manfred Hugenschmidt "Repetitively pulsed plasma-enhanced laser-target energy transfer processes", Proc. SPIE 3516, 23rd International Congress on High-Speed Photography and Photonics, (22 June 1999); https://doi.org/10.1117/12.350511

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KEYWORDS

Energy transfer

Laser energy

Laser processing

Pulsed laser operation

High speed photography

Laser interferometry

Infrared radiation

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