High-speed electron microscopy of laser-induced vaporization of thin films

Laser-driven explosive vaporization of free germanium films was investigated with a high-speed transmission electron microscope. Double frame and streak imaging with nanoseconds exposure and sweep times were exploited to visualize the fast processes. Using focused 30-ns laser pulses of about 1 μJ an...

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Veröffentlicht in:Journal of applied physics 1991-02, Vol.69 (4), p.2581-2583
Hauptverfasser: BOSTANJOGLO, O, KORNITZKY, J, TORNOW, R. P
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creator BOSTANJOGLO, O
KORNITZKY, J
TORNOW, R. P
description Laser-driven explosive vaporization of free germanium films was investigated with a high-speed transmission electron microscope. Double frame and streak imaging with nanoseconds exposure and sweep times were exploited to visualize the fast processes. Using focused 30-ns laser pulses of about 1 μJ and 10 MW/cm2, the films were shattered within 100–300 ns by three cooperating mechanisms: Marangoni flow, jerky boiling, and capillary forces. These effects are very different from those ablating supported films. They suggest that large temperature gradients of 1000 K/μm centered near 4000 K are generated within the laser spot, and the homogeneous nucleation theory of boiling is not applicable.
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subjects Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Physical properties of thin films, nonelectronic
Physics
Solid surfaces and solid-solid interfaces
Surface energy
thermodynamic properties
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
title High-speed electron microscopy of laser-induced vaporization of thin films
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