Chapter 2  Linear Measurements
Mounting and Aligning the Optics on the Target Machine
2-20 Measurements Reference Guide
Aligning the optics
To align the optics on the target machine, follow these steps:
1 Set the laser head’s upper port to the small aperture by turning the upper 
aperture control (Figure 2-13).
2 Rotate the target into position on the laser head’s lower port by turning 
the lower aperture control.
3 Set the laser head’s turret ring to OTHER.
4 Adjust the laser head so the beam enters the lens on the interferometer 
and the return beam is on or near the target on the laser head’s lower 
port.
Figure 2-13.  Front panel of the laser head 
5 Adjust the interferometer assembly or the laser head so the return beam 
(seen as a dot on the laser head) is centered on the laser head’s target.
1
  Turret ring set to 
OTHER
2   Upper aperture 
control
3   Upper port
4   Lower port with 
target showing
5   Lower aperture 
control
STRAIGHT
AVOID EXPOSURE
LASER RADIATION IS
EMITTED FROM THIS APERTURE
LASER ON SIGNAL
OTHER
4
5
3
2
1
Agilent