Cynosure Cynergy, Technical Manual

Page: 58 / 194

56 of 112 850-1265-000, Rev. 4 Cynosure, Inc.
Resonator Performance
The graph below represents typical Cynergy laser performance—actual performance will vary.
However, there should be no “roll-over,” meaning the output having little or no increase despite
an increase in voltage. When “roll-over” occurs it can usually be attributed to poor alignment.
See the “System Check” or “Laser Cal Condition Table” on the following page that flags errors
once the FOM has been determined. A minimum FOM performance of > 2.5 J (for the PDL)
and of
> 30 (for the YAG) is required for operation.
Cynergy (Output vs. Voltage)
0
10
20
30
40
50
60
70
80
300 400 500 600 700 800 900 1000 1100
Start Cap Bank Volts (V)
R
eso
n
a
to
r O
u
t (J)
YAG, 5 ms, 1*5.0 DYE, 0.5 ms
Figure 22–Resonator Performance
A separate performance standard for each laser has been established for the resonator output. In
order to meet the system performance criteria, the resonator must normally generate
approximately 15-30 % more output to compensate for losses in coupling to the delivery system.
For the PDL laser, the resonator must be capable of generating a minimum of 10 joules/pulse @
1Hz or 10 Watts. This is based on performance criteria of 10 J/cm
2
with a 10-mm handpiece,
which equals ~8 joules/pulse out of the handpiece. Adding a nominal 20% for delivery system
losses, this means that the resonator must produce 10 joules/pulse.
For the Nd:YAG laser, the resonator must be capable of generating a minimum of 78.5
joules/pulse @ 1Hz or 78.5 Watts. This is based is based on performance criteria of 80 J/cm
2
with a 10-mm handpiece, which equals 62.8 joules/pulse out of the handpiece. Adding a nominal
20% for delivery system losses, this means that the resonator must produce 78.5 joules/pulse.
If transmission is accepted as low as 52%, the laser heads must be capable of approximately 15 J
for the PDL, and approximately 125 J for the YAG. This is difficult for the laser to achieve and
failure is imminent because the lost power is overheating some component. Good delivery
system transmission is imperative for proper, long-term resonator performance.