Cynosure Cynergy, Technical Manual

Page: 70 / 194

68 of 112 850-1265-000, Rev. 4 Cynosure, Inc.
Resonator Alignment Procedure, PDL
1. Make certain that the laser output coupler (partial) mirror and maximum reflector are free
of dirt and dust. If necessary, remove any dust or other particles by blowing with a
pressurized gas-jet lens cleaner. Place the head of the energy meter in the beam path.
CAUTION: The entire beam profile must fill at least 75% of the detector area. Take
a burn to confirm the size of the beam and that it is centered on the detector face.
Make sure the burn paper is inside a plastic bag to prevent the burn residue and
smoke from depositing on the output coupler or other optics.
2. Set up the laser energy/power meter to read average power (watts), on a 3.0 watt range.
3. Fire the laser.
3.1
If the laser is not producing a laser beam, increase the voltage until lasing occurs.
3.2 If no lasing occurs at the highest voltage setting, perform, “Rough Resonator
Alignment,” see page 69.
WARNING: Be cautious adjusting one mirror at a time. The alignment screws are
directly adjacent to lethal high voltages. High voltage is present; electrical shock
can occur.
4. Using an insulated and extended 1/16" socket head driver (706-0133-000), optimize the
output of the maximum reflector. Use all three adjustments. Turn the voltage down as the
energy increases during optimization. During alignment, the power should stay between
approximately 2.5 to 5.0 watts. Repeat this several times until no further improvement
seems possible.
5. Repeat step 5 for the other reflector.
6. Position a piece of ZAP-IT laser alignment paper approximately 6 inches from the partial
reflector. Fire a single laser pulse onto the paper.
7. Examine the burn pattern. If necessary, adjust the laser voltage higher or lower, firing a
single shot on an unexposed area of the burn paper after each adjustment, until proper
exposure is obtained.
8. The burn should be circular with symmetrical edges. The spot should be a round spot
with a centrally high intensity, tapering off at the edges. There should be no asymmetrical
structures such as rings, spots, shadows or satellites.
9. It may be necessary to reduce the voltage to the threshold of lasing to observe subtle
structure to the burn that would be “washed out” at higher voltages. At threshold, the
beam appears as a perfect ring.
10. Check that the resonator meets the resonator performance criteria. See section starting on
page 56.