RTC6 boards
Doc. Rev. 1.0.21 en-US
7 Basic Functions for Scan Head Control and Laser Control
190
7.4.4 YAG Modes 1, 2, 3, 5
set_laser_mode( [
1
,
2
,
3
or
5
] ) sets one of the
YAG modes.
The timing diagram, see Figure 53, shows the
corresponding signals using the example of an
isolated mark command.
In each YAG mode, for “laser active” operation:
• The LASERON signal is switched on
• A Q-Switch signal is outputted at the LASER1
output port, see Q-Switch Signal, page 190.
• A adjustable FirstPulseKiller signal is outputted at
the LASER2 output port, see FirstPulseKiller
Signal, page 190.
In each YAG mode, for “laser standby” operation:
• The LASERON signal is switched off
• Standby pulses are outputted at the LASER1
output port. Pulse length and period duration of
the standby pulses can be set by set_standby or
set_standby_list.
Notes
• LASER1 signals are
– activated by:
HalfPeriod
0 and
PulseLength
0
– deactivated by:
HalfPeriod
= 0 and/or
PulseLength
= 0 (default setting after
load_program_file)
Q-Switch Signal
The Q-Switch signal serves to control the quality
switch of the laser. The Q-Switch period duration and
pulse length are set by set_laser_pulses,
set_laser_pulses_ctrl or set_laser_timing.
Notes
• See also Section ”Pulse Completion”, page 186
(Signals for “Laser Active” Operation).
• See also Section ”Pulse Completion”, page 186 of
(Signals for “Laser Standby” Operation).
FirstPulseKiller Signal
The FirstPulseKiller signal serves to signal the first
laser pulses of a pulse sequence, if they do not
correspond to the usual continuous power.
This signal is only provided. The laser itself must
respond appropriately. The FirstPulseKiller signal is
outputted automatically together with the
LASERON signal.
The length of the FirstPulseKiller signal is set with
set_firstpulse_killer or set_firstpulse_killer_list.
Differences Between the YAG Modes
YAG Mode 1, YAG Mode 2, YAG Mode 3 and
YAG Mode 5 only differ in the relative start time of
the first Q-Switch pulse with reference to the
FirstPulseKiller signal, see also the timing diagrams in
Figure 53.
After the Q-Switch delay has expired, the first
Q-Switch pulse starts. The Q-Switch delay value can
be specified by set_qswitch_delay or
set_qswitch_delay_list; alternatively by selecting
the YAG mode:
• YAG Mode 1: 0
• YAG Mode 2: length of the FirstPulseKiller signal
• YAG Mode 3: 10 µs
• YAG Mode 5: value from set_qswitch_delay or
set_qswitch_delay_list
By set_laser_mode, the Q-Switch delay is merely
preset. Therefore, in YAG Mode 1, YAG Mode 2,
YAG Mode 3, too, the Q-Switch delay can be
subsequently changed by set_qswitch_delay or
set_qswitch_delay_list.
In YAG Mode 2, the Q-Switch delay is also adjusted
accordingly with each set_firstpulse_killer or
set_firstpulse_killer_list.
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