J.A. Woollam M-2000, Hardware Manual

Page: 74 / 178

74 ©2023 J.A. Woollam Co. M-2000® Hardware Manual
Figure 4-39. MQD-Dual filter wheel selection.
5. If necessary (to avoid detector overload), adjust the iris(es) by rotating
the small silver lever around the fiber coupler or filter position by rotating
the wheel. This will change the iris diameter/ND filter throughput
affecting the amount of light available to enter the spectrometer(s)
through the fiber(s).
6. Select 'Cancel Raw Signal Display' (or Press ESC) to exit the screen.
Sample Stage Alignment
Thus far, we have aligned the Source and Receiver Units to the Variable Angle
Base. Next, we need to align the Sample Stage to the Measurement Beam.
Once we have the sample stage aligned to the system, we will align the
Lookdown Detector to the sample stage to allow for automated sample
alignment for future samples.
Note: This procedure should only be performed when the system is first
installed, if the beam alignment has been adjusted or if the
Lookdown detector alignment is under question.
1. Remove any custom mounts or samples and mount the 25nm Oxide on
Silicon Calibration Wafer directly to the sample stage. Make sure to
switch on the vacuum to hold wafer in place.
POSITION INTENSITY
I 100%
II 70%
III 50%
IIII 20%