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Structure of Laser Unit (AOM)
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AOM controls the strength of laser light.
The diffracted light of first order is used for exposure.
Diffracted light of
first order
Laser
AOM
100 %
20 %
Exposure
80 %
0-th order light
The direct light is called 0-th order light.
Explanation
• When the voltage is not turned ON to AOM, the incoming laser beam passes through as it is.(0th order light)
• When turning ON the high frequency voltage, the ultrasonic waves occurs, and the diffracted
light which is separated from 0-th order light occurs.(Diffracted light of first order)
• Change the rate of 0-th order light and the diffracted light of first order by changing the high
frequency voltage on AOM, and control the strength of light (diffracted light of first order) to
be used for exposure.
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