Abstract
A fast acousto-optic Q switch has been demonstrated which relies on a linear FM pulse of acoustic energy to act as a moving lens. While one corrdinate of the focus of the lens is fixed by the rate of frequency sweep, the other coordinate is ’’swept’’ in time by the frequency variation of the pulse. The on time of the switch is proportional to the reciprocal of the pulse bandwidth. Experiments have been conducted which verify the characteristics of this technique. A TeO2 Bragg cell was used in a successful attempt to Q switch a Nd/YAG laser with the acousto-optic lens approach.
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