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The homo-epitaxial growth approach is possible using AlN raw material and high-purity TaC crucibles. The lowest dislocation density was achieved when the starting material was 0.9 mol% impurity free AlN powder, the TaC crucibles were of Nb/Al ratio 14%, and the growth temperature was 500 C. Under these conditions, the homo-epitaxial growth approach leads to large single crystals with large side facets, which is completely different from those obtained by the PVT growth approach. No cracks were observed on the surface of as-grown single crystals, regardless of the hexagonal and rhombohedral morphologies observed on the crystals in this approach. These are the first crack-free AlN crystals reported so far. Only the 5 nm thick SiNx layer was observed on the top of the homo-epitaxial crystals by using the cross-section TEM images. These results show that the present approach can be used to grow large single crystals, which is a big challenge in the homo-epitaxial growth of AlN to date.

Homo-epitaxial growth is not a simple approach when compared to the PVT method, and a number of technological challenges need to be addressed. The presence of high C concentration in the TaC crucibles is the main cause for the origin of dislocations in the crystals. If the initial growth temperature is set low, then the slip efficiency of the seed, crucible and other anvils will be low. This factor, as well as high growth rates, reduces the growth rate. In order to minimize the formation of cracks on the growth surface, etching time should be carefully selected: early termination of the growth using the 532 nm laser should take place as soon as the initial growth angle reaches 90 degree. Slow down of the growth using the 532 nm laser will reduce the rate of C incorporation during the growth. The 532 nm laser beam is also used to initiate the growth by heating up the seed and a second beam is used for the thinning of the crystals. The second laser beam should be precisely focused on the seed before it is started, otherwise large and/or thin single crystals may be obtained instead of small (thickness of 5 to 10 mm), low-dislocation density crystals. The best possible conditions to minimize dislocations in the crystals are achieved when the C crucible temperature is set higher than the as-grown single crystal temperature to ensure a higher C density at the crucible surface. This helps to have higher melting and annealing temperatures in the crucible without the formation of cracks on the growth surface. The C crucible has to be continuously in contact with the source material in order to prevent its dissipation.

Contact lens users are also instructed to wear their lenses for at least eight hours, and they must not rub their eyes. People who are sensitive to light should wear sunglasses or a special filter while working with their contact lenses. Long-term users of contact lenses should practice maintenance and hygiene, such as cleaning their lenses with a soft lens case and storing them in a refrigerator after each use. People who are allergic to certain preservatives in some lenses should check with their eye-care professionals to find out whether a lens product without these preservatives is available. If you are experiencing discomfort or pain in your eyes, you should visit your eye doctor. Some contact lens users may experience discomfort in their eyes after several hours of continued use. If this is the case, stop wearing your contact lenses for the day. The drawings and figures included in the body of the document may be in a different order than the order presented in the list of figures. The drawing in the List of Figures may be different than the corresponding drawing in the Body of the document. There is no such thing as “Figure x.” There is only the name of the figure given in the List of Figures. If you modify the text of the Body of the document, the change does not affect the meaning of the listing of figures (List of Figures). If a figure is missing from the list of figures, check the corresponding text in the Body of the document to see if a new figure has been inserted. The name of the figure in the List of Figures is the name of the figure used in the Body of the document. If you want to replace a figure, it must have the same name. The topography of a tear film in the near-convex contact lens is depicted in Figure 11, which shows the interfaces and dimensions of the gas-liquid and solid-liquid contact zones. The tear film thickness is approximately 1.5 mm. Figure 11. Topography of a tear film.The chemical, biological, and biochemical properties of the tear film are largely determined by the composition of the tear film; they can influence its stability or pathogenesis. The oxygen tension changes significantly during blinking as depicted in Figure 12. The change in oxygen tension can be up to two orders of magnitude, a phenomenon known as cycling. Diagram of a corneal topography after the ‘relaxation’ period from Figure 1. The average aberrations decreased slightly after refractive correction by the procedure described. The patient does not feel undue myopia or hyperopia, and the visual acuity is 6/6. The differences in axial curvature before and after operation are insignificant, which indicates good corneal rigidity.The measurements were taken two months after the operation. The results were compared with the preoperative data. It is necessary to notice that the Alcon wavefront system takes the whole cornea into consideration when calculating wavefront error. Moreover, the cornea has considerable variability of keratometric measurements on a given patient, so the data shown above may not reflect the true value. The topography of the cornea is shown in Figure 13, where corneal power data is displayed in Figure 14. As shown in Figure 14, the curvature of the cornea on the side of the optic-nerve head is greater than that on the front side of the optic-nerve head. It is also concluded that there is a little difference between the right and left eyes. The differences of corneal power can be analyzed on the basis of the principles used in calculating the refractive index of liquids, including optical retardation effects. Figure 13. 5ec8ef588b