摘要 :
The polarization of light has been studied for more than two centuries, and most people have heard of polarized sunglasses- an 80-year-old invention. Yet engineering the polarization properties of guided waves in integrated photon...
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The polarization of light has been studied for more than two centuries, and most people have heard of polarized sunglasses- an 80-year-old invention. Yet engineering the polarization properties of guided waves in integrated photonic devices is not easy, as optical waveguides are not generally sensitive to polarization.
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摘要 :
Although most health scientists now agree that health risks to the skin (e.g., skin cancer) exist from exposure to the ultraviolet radiation in sunlight, a scientific consensus has not really been achieved vis-a-vis sunlight and o...
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Although most health scientists now agree that health risks to the skin (e.g., skin cancer) exist from exposure to the ultraviolet radiation in sunlight, a scientific consensus has not really been achieved vis-a-vis sunlight and ocular health. A growing number of scientists warn of hazards to the eye if ultraviolet radiation-and perhaps even shorter wavelength visible radiation also-is not filtered by lenses. Despite a substantial literature on the adverse effects of ultraviolet radiation (UVR) and intense light upon ocular structures, particularly upon the retina, controversy still surrounds the question of whether the levels of natural and man-made light sources are damaging when encountered under normal viewing conditions. Although scientific evidence accumulates to indicate that chronic exposure conditions may accelerate ageing processes in ocular tissues, the quantitative question of "How much is safe?" remains to be answered conclusively.
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