| 摘要 |
A high gain optically pumped Q-switched laser device includes a mask having cutout portions defining a given pattern disposed in the resonant optical cavity defined between end mirrors at opposite ends of the laser material. Each of the end mirrors is equivalent to an optically flat reflecting surface such that only cross-sectional portions in the laser material similar to the pattern are stimulated when the Q of the cavity is restored to emit narrow pulses of output laser radiation. These pulses have high power densities and may be directly radiated to a target surface to alter the surface in a manner corresponding to the given pattern. The alteration may take the form of actual vaporization, heating, chemical reaction, or oxidation of portions of the surface. Thus, carefully controlled engraving type processes or other processes involving a physical alteration of a surface such as the drilling of square or unusually shaped holes are determined by the pattern can be carried out.
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