| 摘要 |
<p>Apparatus for stabilizing a laser beam includes an acoustooptic cell (12) which receives an input laser light beam and produces an undiffracted, or zero-order, light beam and a diffracted beam in response to an RF signal at a predetermined frequency. The zero-order beam is applied to a utilization device (17, 19) which produces an information modulated output beam at an image zone. In order to reduce noise in the output beam at the image zone, there are provided means (18, 20) for producing an electrical signal which is a function of time-varying changes in the intensity of the zero-order beam, means (31, 34) for producing a reference signal representing the instantaneous intensity of an unmodulated output beam from the utilization device (17, 19), and adjustable means (20, 28) responsive to the electrical signal and the reference signal for effecting changes in the intensity of the zero-order beam to stabilize the beam.</p> |
