63 74 198 D3545
16
D3545
.
201.06.03
.
02 05.2014
System description
Sirona Dental Systems GmbH
Laser operation modes
Operating Instructions SIROLaser Advance
3.2
Laser operation modes
empty
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.
empty
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
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.
empty
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
4
2
0
0
10 000
20 000
30 000
Time [µs]
Power
[W]
6
0
Time [µs]
20 000
30 000
Power
[W]
10 000
6
4
2
0
0
Time [µs]
Power
[W]
100
200
300
0
Time [µs]
Power
[W]
3000
1000
2000
12
10
8
6
4
2
0
14
12
10
8
6
4
2
0
14
NOTICE
The average power may not exceed 6 W in peak-pulse mode.
