| 摘要 |
An image comprising a multitude of small discrete holes is formed by a laser in a radiation absorbing film. Appropriate means form a large number of brief-duration, amplitude-modulated pulses of optical radiation. These pulses are then deflected and focused to form an array of discrete holes in a film, such as a 500 Angstrom thick layer of bismuth, on a polyester substrate. By varying the energy in each pulse, the size of the holes can be varied to form images having a gray scale. |
