RTC
®
5 PC Interface Board
Rev. 1.9 e
7 Basic Functions for Scan Head and Laser Control
139
innovators for industry
Notes
• As in YAG mode 5, the time interval between
LaserOn and the first Q-Switch pulse
(LASER1/LASER2) can be specified via
or
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
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
µ
s).
For RTC
®
4 compatibility mode (for “laser active”
operation), the time base can be set via
(but not via
) for either 1 MHz (1 bit
equals 1
µ
s) or 8 MHz (1 bit equals 1/8
µ
s). 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
µ
s (in RTC
®
5 mode) or 1/8
µ
s (in RTC
®
4
compatibility mode).
• The command
(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
). This cannot be specified for standby
signals; if applicable, these will be cut off.
• The LASER1 signals may be set (via
etc.) prior to or after setting the
pulse-picking laser mode.
•
overwrite any laser mode setting previously set
via
. A subsequent laser mode
setting (via
) will switch off the
pulse-picking laser mode.
