THORLABS LCC3111, Руководство пользователя

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Liquid Crystal Noise Eater
Chapter 8: Maintenance
Page 16
Chapter 8 Maintenance
The noise eater does not require maintenance under normal operating
conditions.
There are no serviceable parts in the noise eater and no reason to open the unit.
If you suspect a problem with your noise eater, please call Thorlabs and a
member of our Technical Support team will be happy to assist you.
8.1. Troubleshooting
Problem Solutions
No Output Power
Turn the power selector to its maximum value and turn the knob all
the way counter clockwise. At this point the noise eater should not
attenuate the beam. If you still have no output power then verify
that the beam is properly aligned to enter the center of the noise
eater’s aperture, and that the beam is perpendicular to the noise
eater’s body. If there is still no optical output power, please verify
that your laser’s operating wavelength and power are within the
specified ranges for the noise eater.
Low Noise Attenuation
Noise attenuation performance depends on many parameters,
including target output power setting and alignment of the beam. If,
after fine tuning the set-point (see section 4.6), the noise
attenuation is still not high enough, we recommend fine tuning the
input polarization of the beam using a linear polarizer and verifying
that the beam is well centered and that the beam path is
perpendicular to the noise eater’s body.
Output is Unstable
1) Check the polarization direction of the input light.
2) If the LED is blinking, or if it is red, you need to reduce
the output power by rotating the knob counterclockwise,
or by selecting a lower power range and readjusting the
knob.
3) The angle of incidence of the input light could be too
high. Make sure the angle of incidence is lower than 2°.