Tempest Nd:YAG Laser Operator’s Manual
38
Figure 4-7: Gemini PIV Beam Overlap Adjustment
1) Remove the smaller optics head cover to provide access to the beam
combining optics and second harmonic generator. Install the
interlock defeat mechanism.
2) Put both lasers into standby mode with the flashlamp voltage just
above threshold for generating second harmonic light.
3) Observe the overlap of the two beams at the point where PIV
measurements will be made. Adjust the polarizer assembly mount to
optimize the overlap of the two beams. Note that the top adjustment
screw on the mirrors controls vertical beam motion, while the bottom
adjustment screw controls horizontal motion.
4) Observe the overlap of the two beams from the measurement area to
the laser. You have finished the alignment if the beams overlap over
the entire distance. If not, continue with step 5.
5) Fire laser #1 and observe the position of the visible beam on the
folding mirror immediately after the second harmonic generator.
Laser #1
Laser #2
Polarizer Assembly
Fold Mirror #3
Optical
Attenuator
(optional)
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