| 摘要 |
<p>A laser ophthalmic surgery apparatus includes an improved control for assuring that the energy output level of the beam delivered to the eye remains within a prescribed tolerance. An energy output sensor (42) receives a small fraction of the laser beam's energy through a beam splitter (36). The sensor is located downstream of all laser pulse shaping parameters associated with the laser cavity (42). During operation of the laser the energy output sensor (42) constantly monitors laser energy as delivered to the target, and in preferred embodiment it monitors pulse-to-pulse energy deviations and calculates a moving average of the pulse energy over a relatively small number of shots. A laser beam light attenuator (22, 20) upstream of the sensor varies the intensity of the laser beam passing through, under the control of a microprocessor (46) which adjust the beam light attenuator in accordance therewith, making compensating adjustements after each shot.</p> |
