Scanlab RTC 5 PC Interface Board - Page 139

RTC
®
5 PC Interface Board
Rev. 1.9 e
7 Basic Functions for Scan Head and Laser Control
139
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Notes
• As in YAG mode 5, the time interval between
LaserOn and the first Q-Switch pulse
(LASER1/LASER2) can be specified via
set_qswitch_delay or set_qswitch_delay_list.
The LASER2 signal synchronously starts with the
LASER1 signal.
• The LASER1/LASER2 signals are activated by
setting the pulse length to a nonzero value and is
deactivated by setting the pulse length to zero
(default setting).
•Note that half of the output period must be
specified for the LASER1/LASER2 signals.
•The commands set_laser_pulses and
set_laser_timing are list commands. They can be
used within a list, for instance, for changing the
laser power at any time between two list
commands.
• The actual output period and the pulse lengths of
laser signals LASER1 and LASER2 (but not the
laser delays) are dependent on the time base.
For RTC
®
5 mode, this is fixed at 64 MHz (1 bit
equals 1/64 µs).
For RTC
®
4 compatibility mode (for “laser active”
operation), the time base can be set via
set_laser_timing (but not via set_laser_pulses
or set_laser_pulses_ctrl) for either 1 MHz (1 bit
equals 1 µs) or 8 MHz (1 bit equals 1/8 µs). For
RTC
®
4 compatibility mode, SCANLAB generally
recommends setting the time base to 8 MHz (via
set_laser_timing(..,..,..,1) ). A time base of
1 MHz should only be chosen if necessary.
The time base for standby signals is always
1/64 µs (in RTC
®
5 mode) or 1/8 µs (in RTC
®
4
compatibility mode).
•The command set_laser_control (bit#0) can be
used to specify whether a (for “laser active”
operation) started modulation pulse (LASER1 or
LASER2) should execute to completion or be cut
off when it has not yet fully executed when the
LASERON signal is switched off (see figure 52,
page 138). This cannot be specified for standby
signals; if applicable, these will be cut off.
• The LASER1 signals may be set (via
set_laser_pulses etc.) prior to or after setting the
pulse-picking laser mode.
• set_pulse_picking and set_pulse_picking_list
overwrite any laser mode setting previously set
via set_laser_mode. A subsequent laser mode
setting (via set_laser_mode) will switch off the
pulse-picking laser mode.