Thermal effect of chemical reactions in interactions of laser pulse with solids

Anatoly Ya. Vorobyov

doi:10.1117/12.193122

4 November 1994 Thermal effect of chemical reactions in interactions of laser pulse with solids

Anatoly Ya. Vorobyov

Proceedings Volume 2246, Laser Materials Processing and Machining; (1994) https://doi.org/10.1117/12.193122
Event: Optics for Productivity in Manufacturing, 1994, Frankfurt, Germany

Abstract

The heat energy released by chemical reactions was measured in the interaction of 50-ns Nd- laser pulse with titanium, germanium, coke, and sulphur samples placed in different gas media. The samples were exposed to focused laser radiation in the intensity range of 1 - 800 MW/cm². It was found that the maximum value of the ratio of released chemical energy to the laser pulse energy is approximately 0.2 for Ti irradiated in oxygen as well as for Ge irradiated in air. For interaction of laser pulse with sulphur in air, the chemical energy released in the laser flare is a factor of 2 greater than the laser pulse energy. In 1-atm oxygen gas medium, this factor increases up to the values more than 3 and the continuous burning of the target arises for some shots. The source of chemical energy is the synthesis of sulphur dioxide. Thermal effect of chemical interaction depends on focal spot size at fixed target size.

Citation Download Citation

Anatoly Ya. Vorobyov "Thermal effect of chemical reactions in interactions of laser pulse with solids", Proc. SPIE 2246, Laser Materials Processing and Machining, (4 November 1994); https://doi.org/10.1117/12.193122

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