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Browse Prior Art Database

Use of Dispersive Medium in Forming Light Beam

IP.com Disclosure Number: IPCOM000094441D
Original Publication Date: 1965-Jan-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Fleisher, H: AUTHOR [+4]

Abstract

Writing bits of information on small areas of a photosensitive medium by a beam of light at different frequencies requires a very small light beam. Difficulties are encountered when using a beam of white light due to the lack of a point source of highly intense light and to the chromatic aberration produced in optics needed when an ordinary beam of white light is used.

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Use of Dispersive Medium in Forming Light Beam

Writing bits of information on small areas of a photosensitive medium by a beam of light at different frequencies requires a very small light beam. Difficulties are encountered when using a beam of white light due to the lack of a point source of highly intense light and to the chromatic aberration produced in optics needed when an ordinary beam of white light is used.

As shown in drawing A, a small intense light beam 1 at different frequencies can be formed by directing light beams, each at a different frequency, from lasers 2 through prism 3. The frequencies of light in beam 1 can be controlled by electro-optic shutters 4 in the paths of the beams from lasers 2. Digital light deflector 5 in the path of light beam 1 can be used for directing light to any desired spot on photosensitive medium 6.

The writing of information on a large area of a photosensitive medium can be accomplished either serially or in parallel by the apparatus in drawing B. In this case, light beams, each at a different frequency, are directed from lasers 8 through collimating lenses 9, masks 10 and electro-optic shutters 12 to grating
14. The light beams at different frequencies are reflected from grating 14 as a single beam 16 to light sensitive medium 18.

In each of the drawings several monochromatic light beams are combined into one collinear beam with relatively little loss.

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