J.A. Woollam M-2000, Hardware Manual

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M-2000® Hardware Manual ©2023 J.A. Woollam Co. 69
3. Move your eye close to the source unit to view along the same path as
the beam. This will allow you to see the beam entering the Receiver Unit
aperture as shown below.
4. If the beam is not centered, center the probe beam on Receiver Unit
aperture by adjusting the Source Tilt Stage using a 3.175mm (1/8”)
English Allen wrench. When the beam is aligned, there should be a
uniform white halo around the aperture (shown below). Misalignment
results in a "crescent" halo that is larger on one side of the aperture.
Figure 4-29. Centering the beam on Receiver Unit aperture.
Receiver Unit Alignment
After the Source Unit alignment has been verified, the light beam will be
centered on the front aperture of the Receiver Unit. However, this does not
ensure alignment through the Receiver Unit. The tip-tilt of the Receiver Unit
controls its optical axis and makes sure it is collinear with the beam as it travels
through the Receiver Unit. To verify alignment, a 4-quadrant alignment detector
is located inside the Receiver Unit. In this section, we will verify alignment and
adjust the Receiver Unit to the measurement beam if necessary.
1. Select Hardware > Controls > General >‘Align Sample’. The software will
ask “Would you like to perform a full sample alignment?” Select ‘No’.