| 摘要 |
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.
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