Method and apparatus for homogenizing a collimated light beam
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United States of America Patent
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Jul 19, 1994
Grant Date -
N/A
app pub date -
Apr 23, 1991
filing date -
Apr 23, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for smoothing and homogenising the cross-sectional intensity distribution of the output from an excimer laser for improved application of excimer lasers to optical laser surgery to the cornea. The laser beam is focused by means of a cylindrical lens or mirror and then filtered using a narrow gap spatial filter to smooth the intensity distribution by removing high spatial frequencies. The resulting output beam may be collimated by means of a second cylindrical lens or mirror for application to further optical processes.
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