Optical: systems and elements – Single channel simultaneously to or from plural channels – By surface composed of lenticular elements
Patent
1995-10-03
1997-12-02
Nelms, David C.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By surface composed of lenticular elements
359652, G02B 2710, G02B 300
Patent
active
056942494
ABSTRACT:
The invention relates to a three-dimensional optical memory element. This element is made of glass and includes: a glass matrix which has a first refractive index; and a plurality of spots which are three-dimensionally distributed in the glass matrix and each of which has a second refractive index different from the first refractive index. The element is prepared by condensing a pulsed laser beam to focal points in the element so as to prepare, at the focal points, the spots corresponding to the focal points. Each focal point has a diameter which is approximately equal to a wavelength of the pulsed laser beam. The element has a sufficient weatherability and a sufficient resistance to heat and light. It is possible to write information at each spot having a diameter equal to or shorter than the wavelength of the laser beam, with high density and good contrast.
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Central Glass Company Limited
Mack Ricky
Nelms David C.
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