Troubleshooting
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• Check that the laser is running at full energy, with the lamp voltage is
set to the maximum.
• Check the number of shots on the flash lamp. This can be estimated
from the date of the last flash lamp change and the average usage per
day. If the number of shots fired exceeds 30 million shots, change
the flash lamp.
• For fluctuations in the laser energy in the harmonics check that the
laser is running at full energy.
Call New Wave Research if it is not possible to increase the laser pulse
energy by this procedure.
Procedure 5. Clipped laser beam
The output beam of the Tempest Nd:YAG laser should be round,
symmetric with even energy distribution. An object in the beam path
may clip the laser beamresulting in an output beam which appears
asymmetric, with a sharp edge. If the output beam is clipped, check the
following.
• Check the beam path to ensure that there are no foreign objects in the
path.
• Turn the flashlamp voltage knob counterclockwise to reduce the
energy to just above threshold. Trace the beam through the head
examining the beam profile after each mount. Try to determine
which mount is responsible for clipping the beam. Use an infrared
card to view the beam before the harmonic generators.
• Check the dichroic mirrors and mounts to ensure that they are not
clipping the beam.
• Check that the mechanical shutter is fully removed from the beam
path and is not clipping.
• When you have found the object that is responsible for clipping the
beam, correct the situation and ensure that the beam path is fully
clear.
Procedure 6. Low second harmonic energy
If the second harmonic output energy is low, please check the following
points.
• Check the dichroic mirrors to ensure that the SHG mirrors are
installed, are clean and undamaged.
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