Abstract
The intrinsic breakdown in alkali-halides induced by Q-switched glass and ruby lasers is reported. The threshold electric fields for optical breakdown are nearly equal to the D.C. impulse breakdown fields. The results of laser-induced charge collection show that the collected charges increase in proportion to In (I: laser light intensity, n: constant) at power levels below the breakdown threshold. In the pre-breakdown region, however, the collected charges increase exponentially with increasing laser intensity leading to final breakdown. From these results the mechanism of laser-induced breakdown in alkali-halide crystals is concluded as follows : free electrons produced by multiphoton ionization from shallow donor levels such as color centers are accelerated by the laser electric field and cause avalanche impact ionization, which is analogous to the case of D.C. breakdown.
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