Method and apparatus for altering the properties in light absorbing material
OwnerReginald Birngruberinventor
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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.
Claims11
A method of coagulating a material which has a plurality of spaced light absorbing structures therein comprising the steps of:
- directing a beam of light onto and through the material to be influenced;
- and
- pulsing the light beam with a pattern of successive pulses to achieve coagulation of the material substantially only at each light absorbing structure, the pattern of successive light pulses being a plurality of pulses of predetermined number, pulse duration, pulse energy, and repetition rate matched to the spatial distribution and size of the light absorbing structures and to the sensitivity of the material to coagulation.
Dependencies are inferred from the claim text.