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i.
The interferometers are not sensitive to where on the aperture the laser beam comes
in or goes out nor are they sensitive to the direction from which the beam is origi-
nated or reflected.
2.43 Alignment Tips
Understanding the following relationships between the movement of the retroreflector and
the stationary interferometer will make it easier to decide how to align these two components
in respect to each other. If the 10702A Linear Interferometer is the moving component, see
Figure 2-77 for an explanation of the Option 001 windows. If the 10705A Single Beam Interfer-
meter is used
it
must be the stationary component. Figure 2-52 shows a sequential relationship
with the misalignment exaggerated for clarity. To initially align the components use the fol-
lowing sequence:
a.
With the retroreflector a s close a s possible to the interferometer (position A of Fig-
ure 2-52), adjust any component (laser head, interferometer, or retroreflector) to get
the small spots to overlap at the receiver (a receiver alignment target makes this ad-
justment easier).
b.
Move retroreflector to position B and adjust the laser beam by angularly moving the
laser beam until the small spots again overlap at the receiver.
NOTE
As indicated by steps a and b, adjust the retroreflector to re-
duce alignment error when the distance between the com-
ponents is small and adjust the laser beam when the distance
is large.
c.
Move the retroreflector back (position A"). If
it
does not align properly, move the
retroreflector until the spots again overlap.
d.
Move the retroreflector to position B' and verify the system remains aligned. If neces-
sary, repeat this procedure until you are certain that the optical leg being aligned re-
mains aligned over the full path of travel.
DIRECTION
,----
A'
B
-------a-c--
PROJECTED
PATH
DIRECTION
OF
TRAVEL
OF
TRAVEL
*
TRAVEL
D
Figure 2-52. Alignment Tips
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