Variable attenuator
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United States of America Patent
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Issued Date -
Jan 19, 2006
app pub date -
Jan 31, 2003
filing date -
Jan 31, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Linearly polarised laser pulses are variable attenuated by rotating a plate (20) with respect to the optical axis (10). A second plate (21) may be arranged in a symmetrical manner to compensate for offset of the pulse from the optical axis (10). A feedback system may be used to control the orientation of the plates (20, 21) to achieve the desired intensity. The plates (20, 21) may comprise uncoated glass substrate, and are suitable for attenuating high energy pulses such as those used in eye surgery.
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