Variable attenuator for laser radiation
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United States of America Patent
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May 4, 1982
Grant Date -
N/A
app pub date -
Feb 25, 1980
filing date -
Feb 25, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a variable attenuator having two phase gratings (1 and 2) with rectangular grooves. In a first embodiment of the present invention the gratings are slidably mounted (10, 20, 30) so that the gratings have the grooves parallel and the faces in close proximity. As one grating is translated relative to the other the light passing through the device may be varied from total extinction to substantially total transmittance. A single device can be fabricated to provide this attenuation for radiation spanning the visible spectrum. In other embodiments the gratings are fixed relative to one another and the entire device is moved relative to the beam to be attenuated.
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