Showing papers on "Light field published in 1979"

Refractive index determination by the focusing method.

Abstract: We show that it is possible to determine the refractive index distribution of a fiber or preform with slight index variation by observing the power distribution of the light field that is focused by the core acting as a lens. This method requires index matching of the cladding and illumination of the core at right angles to its axis with a broad beam of incoherent collimated light. The refractive index distribution is obtained after two numerical integrations to be performed by computer. The first integration establishes the relation between the output and input ray positions from the observed power distribution, the second uses this information to determine the refractive index distribution. However, it is not necessary to solve a large system of simultaneous equations. The sensitivity of the method to measurement inaccuracies was tested by computer simulation. It was found that the method has a builtin smoothing effect that attenuates rather than amplifies measurement errors.

Liquid crystal display cell having a light field background

Abstract: The instant invention is a light field liquid crystal display cell with a seal and pattern layer applied to the cell substrates. Dark segments are displayed against a lighter background. Polymeric substances can be used to space and seal the cell substrates, and the light field background is created without masking the cell substrates.

Cooling, trapping, and storage of atoms by resonant laser fields

Abstract: Analysis of the possiblity of cooling, trapping, and storage of atoms in the resonant field of a laser standing wave is presented. Under certain regimes of frequency scanning the laser radiation can cool atoms in low-pressure gas to the temperature T ≃ 10−4−10−3 K. Because of gradient force effects, cooled atoms will be held in the light field for a long time. Joint cooling and storage of atoms in a resonant light field is important for spectroscopic studies with an extremely high sensitivity and resolution.