Beam scanning method and apparatus

Details Beam scanning method and apparatus Beam scanning method and apparatus

1989-10-27

1991-04-02

Arnold, Bruce Y.

350 65, 350 67, G02B 2608

Patent

active

050043110

ABSTRACT:
Beam scanning method and apparatus are shown comprising a cylindrical mirror upon which a focused beam is directed through the focus of the cylindrical mirror. The axis of the focused beam is pivoted about the focus of the cylindrical mirror for scanning the focused beam across the cylindrical mirror such that the axis of the focused beam reflected from the cylindrical mirror undergoes translational movement. A focus defect is introduced in the focused beam by reflection from the cylindrical mirror, the magnitude of which defect is a function of the angle between the optical axis of the cylindrical mirror and focused beam axis. Astigmatism is introduced in the focused beam directed onto the cylindrical mirror for at least partial compensation of the focus defect. By varying the astigmatism as a function of the angle between the optical axis of the cylindrical mirror and focused beam axis the focus defect may be eliminated when a parabolic cylindrical mirror is employed. Although either a circular or parabolic cylindrical mirror may be used, a parabolic cylindrical mirror is preferred to minimize the focus defect.

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