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Model
5528A
Alignment
Techniques
I
0
I
DISPLACED
I
-
-I,
o
I
RETROREFLECTOR
I'
OOT
0
I
_ _ -L
~
INTERFEROMETER
DDT
Figure
15-3.
Result of Retroreflec/or Movement
3.
Now make
a series of adjustments
to the Laser Head until the beams returning
from
both
Optics are again centered on
the Laser Head's return port target.
(Use
the procedure
given
below
with
Figure
15-4.)
Verl
ical
Axis
a.
Tilt the Laser Head up
or
down until both return dots
are
in line.
(See step "1"
in Figure
15-4.)
(You are
matching
the
Relroreflector's position
with this adjustment.
)
b.
Now
translate the Laser Head up
or
down until
the
Interferometer's return dot is
again
centered on
the Laser Head's return
port. (See step "2"
in Figure 15-4.
)
(You
are
maintaining
the Interferometer's
position with
this
adjustment.
)
If the
dots are
no longer
in line
at
this
point,
keep
repeating steps "a" and
"
b"
until the dots are in line,
as shown
in
step "2" of Figure
15-4.
Horizontal Axis
c.
Turn the Laser Head left
or right
until
both
dots
overlap. (See step
"
3"
in Figure 15-4.
)
(You
are matching the Reflector's position
with this
adjustment.
)
d.
Now
translate the Laser left
or
right until both dots movetothe
cel1terofthe
return port.
(See step "4" of Figure 15-4.
)
(You are
maintaining the Interferometer's position with this
adjustmenL
)
If
the dolS
separate at
this
time,
repeat
steps
"c"
and "d" again.
At the
end of
this
procedure,
both dots should overlap completely at
the Laser Head's return port.
4.
After aligning, continue to move
The
Retroreflector
toward
the
end of
travel.
Stop and
repeat
the previous procedures each
time the Retroreflector return beam
gets close to
being
clipped by the
Interferometer,
or at the end of travel.
15-5
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