Agilent Technologies 5517B, User Manual

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56 Agilent 5517B/BL/C/D/DL/FL User’s Guide
6
Using the Laser Head in a System
Aligning the Optics
The laser head, optics, and receiver must be aligned so the laser beam
from the optics returns to the receiver lens.
1
Set the laser head on a stable surface and point the beam in the
direction you intend to move the optics.
2
Set the interferometer in the laser beam path so the beam enters the
interferometer aperture perpendicular to the aperture. You may need to
fasten the interferometer in place with a clamping fixture.
3
Set the reflector in the laser beam line coming from the interferometer.
Adjust the reflector to reflect the beam back into the interferometer.
4
Place the receiver parallel to the laser beam from the laser head to the
interferometer. The lens must be facing the interferometer. Fasten the
receiver in place with a fixture or clamp.
5
Adjust the reflector and receiver to get the return beam on the receiver
lens. When the
Laser Ready
indicator comes on, the green LED on the
receiver will light when the beam alignment is satisfactory.
6
Block the beam from the interferometer to the receiver. The green LED
on the receiver should go out. Unblock the beam and the green LED
should light again. If this happens, the basic optics alignment is
complete, and you can skip step 7 of this procedure.
If the receiver´s green LED stays on when the beam from the
interferometer is blocked, the receiver gain is too high. Go to the next
step.
7
With the beam blocked, turn the receiver´s gain adjustment control
until the LED goes out. When the beam is unblocked, the LED should
light again, indicating that the optics are aligned properly.
If the green LED does not light, readjust beam alignment until it does
light.
NOTE
The following generic alignment procedure covers the basic steps
required to align the optics. The
Laser and Optics User's Manual
contains detailed alignment procedures that are specific to the optic and
receiver being used. Those procedures should be followed when
installing a system.