公开(公告)号：US06229600B1

公开(公告)日：2001-05-08

申请号：US09163657

申请日：1998-09-30

Applicant: Iouri Martynov

Inventor： Iouri Martynov

IPC: G01J100

CPC classification number: G11B7/13925 ,  G02B27/0025 ,  G11B7/0948 ,  G11B2007/0013

Abstract: The spherical aberration of an optical beam is determined by focusing the beam, and dividing its cross-section in at least two concentric zones. The sub-beams passing through the zones are focused each on a focus-detection system. The distance between the positions of the two foci is a measure for the spherical aberration present in the beam.

Abstract translation: 通过聚焦光束并将其横截面分成至少两个同心区域来确定光束的球面像差。 通过这些区域的子光束聚焦在聚焦检测系统上。 两个焦点的位置之间的距离是存在于光束中的球面像差的度量。