OPTICAL DEVICE AND ASSOCIATED SYSTEMS

An alignment system aligns a laser beam to a desired position in a reference plane and to a desired direction in the reference plane. The system diffracts the laser light into different diffraction orders that are projected onto a detection plane using different lenses. As the locations of the projections of the different diffraction orders in the detection plane respond differently to changes inposition and in direction of the beam in the reference plane, the locations of the projections enable to determine how to adjust the beam so as to get the beam properly aligned. The diffraction and the projection can be implemented by a hologram. 对准系统将激光束与参考平面中的期望位置和参考平面中的期望方向对准。该系统将激光衍射成不同的衍射级，使用不同的透镜将不同的衍射级投影到检测平面上。由于不同的衍射级在检测平面中的投影的部位对束在参考平面中的位置和方向的变化做出不同的响应，因此投影的部位使得能够确定如何调节束以便使束正确地对准。衍射和投影可以通过全息图实现。