Controlling radiation beam diameters
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United States of America Patent
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Jul 19, 1988
Grant Date -
N/A
app pub date -
Jan 22, 1987
filing date -
Jan 31, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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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