发明名称 |
Controlling radiation beam diameters |
摘要 |
The invention relates to a method and an apparatus for reducing the diameter tolerance of a laser beam. A lens (3) is positioned so that one of the focal planes of the lens (3) is in the region of a limit (5) of the Rayleigh range of the beam (19). The lens (3) forms a second beam waist at a position (6), where a modulator (10) is placed. The beam (21) then passes through beam expansion apparatus (11,12,13) before being collimated by a lens (14). The collimated beam (25) is then focussed to a third beam waist at the recording drum (17), via a lens (18) and mirror (15).
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申请公布号 |
US4758068(A) |
申请公布日期 |
1988.07.19 |
申请号 |
US19870005983 |
申请日期 |
1987.01.22 |
申请人 |
CROSFIELD ELECTRONICS LIMITED |
发明人 |
AUGHTON, JOHN E.;GRAY, JAMES H. |
分类号 |
G02B27/00;B23K26/06;G02B6/42;G02F1/00;G05D25/00;(IPC1-7):G02F1/03 |
主分类号 |
G02B27/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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