| 摘要 |
A light beam scanning system has a Bragg acousto-optic deflector for dynamically deflecting an input beam through a predetermined scan angle. The system scan angle is caused to be greater than the scan angle of the acousto-optic deflector by the use of a static polarization-sensitive element, such as a Wollaston prism, and a polarization switch. The deflector transmits the beam in a first direction when the beam has a first polarization state and in a second direction when the beam has a second polarization state. The polarization switch switches the polarization of the beam from the first polarization state to the second polarization state. Control means synchronizes the acousto-optic deflector and polarization switch to cause the deflector to sweep the beam through its scan angle, initiating in the first direction when the beam has the said first polarization state and through its scan angle again, initiating in the said second direction, when the beam has the second polarization state. The system is depicted for use as a laser character generator. An associated method for enhancing the angular resolution of a light beam deflecting system is also disclosed.
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