Figures & data
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Figure 2. SEM images of the surface morphology of the sapphire sample (a) before LSP; (b, b’) after LSP at room temperature, which has significant surface damage; (c, c’) after HTLSP at 1200°C, which remained intact with occasional microcracks; (d) transmittance before and after HTLSP.
![Figure 2. SEM images of the surface morphology of the sapphire sample (a) before LSP; (b, b’) after LSP at room temperature, which has significant surface damage; (c, c’) after HTLSP at 1200°C, which remained intact with occasional microcracks; (d) transmittance before and after HTLSP.](/cms/asset/174e0352-3ed2-482e-a70f-ef24aa09f4a8/tmrl_a_1862933_f0002_oc.jpg)
Figure 3. (a) Raman peak shift in the center of the HTLSP-treated spot. (b) Residual stress distribution in a laser-irradiated spot of the sapphire sample after HTLSP at 1200°C. (c) Scanning line of Raman spectroscopy on the surface of the laser-irradiated spot.
![Figure 3. (a) Raman peak shift in the center of the HTLSP-treated spot. (b) Residual stress distribution in a laser-irradiated spot of the sapphire sample after HTLSP at 1200°C. (c) Scanning line of Raman spectroscopy on the surface of the laser-irradiated spot.](/cms/asset/1c14cc06-5348-409e-8d15-0e5301dc2f24/tmrl_a_1862933_f0003_oc.jpg)
Figure 4. Diffraction-contract bright-field TEM images of cross-sectional microstructures of sapphire: (a) before HTLSP; (b, c) dislocations structures after HTLSP at 1200°C (b) near the surface and (c) at a depth of 10 µm; (d) dislocation density distribution along the depth after HTLSP at 1200°C. TEM images were taken close to the [1 1 -2 0] zone axis to reveal dislocations (marked by white arrows).
![Figure 4. Diffraction-contract bright-field TEM images of cross-sectional microstructures of sapphire: (a) before HTLSP; (b, c) dislocations structures after HTLSP at 1200°C (b) near the surface and (c) at a depth of 10 µm; (d) dislocation density distribution along the depth after HTLSP at 1200°C. TEM images were taken close to the [1 1 -2 0] zone axis to reveal dislocations (marked by white arrows).](/cms/asset/dbd05f15-d2ae-4ce4-9387-b1e74129e211/tmrl_a_1862933_f0004_oc.jpg)