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The role of radiation transport in the thermal response of semitransparent materials to localized laser heating
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10.1063/1.3549829
/content/aip/journal/jap/109/5/10.1063/1.3549829
http://aip.metastore.ingenta.com/content/aip/journal/jap/109/5/10.1063/1.3549829

Figures

Image of FIG. 1.
FIG. 1.

Absorption coefficient of fused silica as a function of photon energy, pieced together from data in Refs. 12–15, as explained in the text. Photon wavelength λ is related to photon energy Eν by λ = hc/Eν (i.e., photons of energy Eν  = 1 eV have wavelength λ = 1.242 µm).

Image of FIG. 2.
FIG. 2.

The axial energy deposition profiles at four times for 2.35 W of 10.6-µm laser power incident from the right onto a 10 mm thick slab of fused silica for 10 s.

Image of FIG. 3.
FIG. 3.

(Color online) Temperature contours at 5 s from a 2D simulation in which 6 W of 10.6 µm laser radiation is incident from the right on the silica slab for 5 s in a 1 mm diameter spot. The silica slab is 10 mm thick and 20 mm in diameter. Peak temperature in the center of the spot on the surface is 1796 K.

Image of FIG. 4.
FIG. 4.

(Color online) Simulated maximum temperature reached in the spot center on the surface as a function of laser power for 10.6 µm (upper curve) and 4.6 µm (lower curve) laser irradiation in a 1 mm diameter spot on for 5 s.

Image of FIG. 5.
FIG. 5.

(Color online) Simulated temperature history in the center of the spot at the surface with (red curve) and without (blue curve) radiation transport for 9 W of 10.6 µm laser radiation in a 1 mm diameter spot on for 5 s.

Image of FIG. 6.
FIG. 6.

Simulated radial temperature profile at 5 s for 9 W of 10.6-µm laser radiation in a 1-mm-diameter spot on for 5 s.

Image of FIG. 7.
FIG. 7.

Simulated axial temperature profile at 5 s for 9 W of 10.6 µm laser radiation in a 1 mm diameter spot on for 5 s.

Image of FIG. 8.
FIG. 8.

(Color online) Simulated radial temperature difference profiles (temperature profile with radiation transport minus temperature profile without radiation transport) at 5 s for four different powers of 10.6 µm laser radiation in a 1 mm diameter spot on for 5 s.

Image of FIG. 9.
FIG. 9.

(Color online) Simulated axial temperature difference profiles (temperature profile with radiation transport minus temperature profile without radiation transport) at 5 s for four different powers of 10.6 µm laser radiation in a 1 mm diameter spot on for 5 s.

Image of FIG. 10.
FIG. 10.

(Color online) Simulated radial cooling rate difference profiles (cooling rate profile without radiation transport minus cooling rate profile with radiation transport) at 5 s for four different powers of 10.6 µm laser radiation in a 1 mm diameter spot on for 5 s.

Image of FIG. 11.
FIG. 11.

(Color online) Simulated axial cooling rate difference profiles (cooling rate profile without radiation transport minus cooling rate profile with radiation transport) at 5 s for four different powers of 10.6 µm laser radiation in a 1 mm diameter spot on for 5 s.

Image of FIG. 12.
FIG. 12.

Axial conductive flux profiles at 5 and 10 s from 1D simulation for 2.35 W of 10.6 µm laser radiation in a 1 mm diameter spot on for 5 s.

Image of FIG. 13.
FIG. 13.

(a) Harmonic average mean-free paths for nine photon energy groups spanning the radiation spectrum. (b) Axial spectral intensity profiles in the nine photon energy groups at 5 s and (c) at 10 s from 1D simulation for 2.35 W of 10.6 µm laser radiation in a 1 mm diameter spot on for 5 s.

Image of FIG. 14.
FIG. 14.

Axial spectral radiation flux profiles in the nine photon energy groups at 5 and 10 s from 1D simulation for 2.35 W of 10.6 µm laser radiation in a 1 mm diameter spot on for 5 s.

Tables

Generic image for table
Table I.

Photon energy groups and harmonic-mean absorption coefficients used in the 2D simulations. Photon wavelength λ is related to photon energy Eν by λ = hc/Eν (i.e., photons of energy Eν  = 1 eV have wavelength λ = 1.242 µm).

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/content/aip/journal/jap/109/5/10.1063/1.3549829
2011-03-09
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The role of radiation transport in the thermal response of semitransparent materials to localized laser heating
http://aip.metastore.ingenta.com/content/aip/journal/jap/109/5/10.1063/1.3549829
10.1063/1.3549829
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