Backscattered heterodyne Doppler diagnostics of laser-induced near-surface transport phenomena

Vyacheslav M. Gordienko; E. M. Chastookhin; Nikolay N. Kurochkin; Vladislav Ya. Panchenko

doi:10.1117/12.203617

1 March 1995 Backscattered heterodyne Doppler diagnostics of laser-induced near-surface transport phenomena

Vyacheslav M. Gordienko, E. M. Chastookhin, Nikolay N. Kurochkin, Vladislav Ya. Panchenko

Proceedings Volume 2498, Laser Methods of Surface Treatment and Modification: ALT '94 International Conference; (1995) https://doi.org/10.1117/12.203617
Event: Laser Methods of Surface Treatment and Modification: ALT '94 International Conference, 1994, Konstanz, Germany

Abstract

Laser processing has become a powerful tool for surface or bulk modifications and is applied successfully in many areas. The use of laser in technology depends on the knowledge of the physics of the processes that occur on interaction between laser radiation and matter. To optimize laser material processing an effective diagnostic method should be developed. Strong light scattering is very typical for laser processing, so measured parameters of scattered light bring information of the process, including velocity field. That opens the way to developing laser physic methods for non-destructive diagnostics and on-line control. The main idea of our measurements is by irradiating the surface of strongly absorbing condensed matter with the intense coherent radiation one can on the one hand induce such phase transitions as thermocapillary convection and evaporation and on the other hand form and observe the Doppler shift in the frequency of radiation backscattered from scatterers within the irradiated volume and consequently measure the velocity of laser induced near-surface hydrodynamic processes.

Citation Download Citation

Vyacheslav M. Gordienko, E. M. Chastookhin, Nikolay N. Kurochkin, and Vladislav Ya. Panchenko "Backscattered heterodyne Doppler diagnostics of laser-induced near-surface transport phenomena", Proc. SPIE 2498, Laser Methods of Surface Treatment and Modification: ALT '94 International Conference, (1 March 1995); https://doi.org/10.1117/12.203617

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