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- Title
Temperature Relaxation in Glass-Forming Materials under Local Fast Laser Excitations during Laser-Induced Microstructuring.
- Authors
Minakov, Alexander; Schick, Christoph
- Abstract
Featured Application: The obtained knowledge can be useful for understanding and optimizing various technologies with glass-forming materials under local fast laser excitations. The ability to control the temperature distribution T (t , r) and the rate of temperature change R t , r inside glasses is important for their microstructuring. The lattice temperature is considered at time t , exceeding the electron–phonon thermalization time, and at a distance r from the center of the model spherical heating zone. In order to describe thermal excitations, the heat capacity of glasses must be considered as a function of time due to its long-term relaxation. A method for the analytical calculation of T (t , r) and R (t , r) for glasses with dynamic heat capacity c d y n (t) is proposed. It is shown that during laser microstructuring, the local cooling rate − R (t , r) significantly depends on the time dispersion of c d y n (t) . It has been established that at the periphery of the model heating zone of the laser beam focus, the local cooling rate can reach more than 1011 K/s. Strong cooling rate gradients were found at the periphery of the heating zone, affecting the microstructure of the material. This effect is significantly enhanced by the time dispersion of c d y n (t) . The effect associated with this time dispersion is significant, even well above the glass transition temperature T g , since even short relaxation times of the dynamic heat capacity c d y n (t) are significant.
- Subjects
GLASS transition temperature; HEAT capacity; TEMPERATURE control; TEMPERATURE distribution; LASERS; ELECTRON temperature
- Publication
Applied Sciences (2076-3417), 2024, Vol 14, Issue 3, p1076
- ISSN
2076-3417
- Publication type
Article
- DOI
10.3390/app14031076