DAZZLER
TM
system manual Part I : installation & operation 4.3
Figure 4.14: Dialog box and warning displayed when the Trigger to Laser value is higher than
the trigger period.
4.3.2 Trig on Previous mode
When Equation 4.1 is not verified, Trigger Delay cannot be computed using Equation 4.1. In
this case the software automatically switches to the Trig on Previous mode. This is indicated
in the Trigger Delay control label, as shown on figure Figure 4.15.
Figure 4.15: Trig&Mode panel showing Trig on Previous mode controls
In this mode, the trigger used to start delay generation is not the one associated with the
diffracted optical pulse, but the previous one as shown in figure Figure 4.16. To compute the
Trigger Delay value, the trigger period (1/Repetition Frequency ) is added to the right-hand
side of Equation 4.1.
Trigger Delay = Trigger to Laser − T
Xtal
− T
p
+
1
RepRate
(4.2)
Since the laser repetition rate is used by the Trigger Delay computation, its value must be
set manually by the user. This avoids the delay value to fluctuate with Repetition Frequency
measurements (see subsection 4.2.2 for details).
4.3.3 Influence of Trigger Delay limits
The internal delay generator inside the Dazzler
TM
RF unit has hardware limitations: though
these strongly depend on the Dazzler model, the typical range stands from a fraction of a
microsecond up to a few milliseconds (for standard HR25 models with V5 boards, values can
be between 0.72µs and 5825µs ).
When the result of equation Equation 4.2 is outside the generator internal delay range, the
software forbids the use of the Trig on Previous mode. For a standard HR25 model with a V5
V3.00 - 8
th
April 2019 (ContentsTable) (FiguresTable) 32/94
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