Method and apparatus for altering the properties in light absorb

Details Method and apparatus for altering the properties in light absorb Method and apparatus for altering the properties in light absorb

1993-02-23

1994-04-12

Niebling, John

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20415761, 204901, C25F 500

Patent

active

053022599

ABSTRACT:
A method and apparatus are disclosed for altering the properties of light sensitive material, for example, biological material, which has a plurality of randomly spaced light absorbing structures thereon. A beam of light, for example, from a laser, is directed, as by scanning, onto a site of the material to be influenced. In order to achieve changes in the properties of the light sensitive material substantially only at each light absorbing structure, the light beam is modulated with a pattern of successive pulses, the pattern being a plurality of pulses of selected duration, energy level, and repetition frequency. The light induced changes may be thermal, mechanical, or chemical in nature.

REFERENCES:
patent: 3941670 (1976-03-01), Pratt, Jr.
patent: 4115280 (1978-09-01), Pratt, Jr.
patent: 4676880 (1987-06-01), Kramer et al.
patent: 4808285 (1989-02-01), Chen et al.
patent: 4822451 (1989-04-01), Ouderkirk et al.
patent: 4880512 (1989-11-01), Cornelius et al.

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