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System description
Laser operation modes
empty
6
4
2
0
0
10 000
20 000
Time [µs]
empty
6
4
2
0
0
10 000
20 000
Time [µs]
empty
14
12
10
8
6
4
2
0
0
1 000
2 000
Time [µs]
14
12
10
8
6
4
2
0
0
100
Time [µs]
16
3.2
Laser operation modes
Continuous wave mode (CW)
CW implies a continuous, uninterrupted laser beam as long as the laser
is activated (and determined by a time set). This means a very good
power control since the maximum power equals the average power.
In adjacent example the laser is in CW mode with a power of 3 W.
30 000
Chopped mode
in literature sometimes also called "pulse mode"
Duty cycle adjustable
The laser beam is interrupted at regular intervals (e.g. 50% ON and 50%
OFF) which can be adjusted via the duty cycle. The average power is the
product of power and duty cycle.
The result is a better thermal control due to the fact that the OFF periods
30 000
are used for thermal relaxation of the tissue.
In adjacent example the laser is in chopped mode with a power of 6 W
and a duty cycle of 20%. The average power is 1.2 W.
Peak-pulse mode
Peak pulse with 14 W
The laser beam is pulsed with a high peak (14 W) for a very short
treatment puls (20 µs) at a very high frequency (20 kHz) to achieve a
longer cooling time. So the duty cycles are reduced.
In adjacent example the laser is in peak-pulse mode with a power of 14 W
and a duty cycle of 20%. The average power is 2.8 W.
Max. average power 6W
NOTICE
The average power may not exceed 6 W in peak-pulse mode.
3 000
200
300
Sirona Dental Systems GmbH
Operating Instructions SIROLaser Advance
62 60 504 D3545
D3545.201.01.08.02 08.2012
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