| 摘要 |
The present invention relates to a focusing system (100) for focusing an electromagnetic beam for three-dimensional random access applications, the system comprising a first pair of acousto-optic deflectors (10) for focusing an electromagnetic beam in an X-Z plane, and a second pair of acousto-optic deflectors (20) for focusing an electromagnetic beam in a Y-Z plane being substantially perpendicular to the X-Z plane, characterised in that the second pair of acousto-optic deflectors (20) are arranged between the acousto-optic deflectors (12, 12′) of the first pair of acousto-optic deflectors (10), such that the first and fourth acousto-optic deflectors (12, 12″) of the system belong to the first pair of acousto-optic deflectors (10) and the second and third acousto-optic deflectors (22, 22″) of the system belong to the second pair of acousto-optic deflectors (20). |
