FASTLITE DAZZLER - High Repetition Rate; No Delay Mode; High Repetition Rate Mode

DAZZLER
TM
system manual Part I : installation & operation 4.3
(a) Mode selection (b) Fixed Trigger To Laser value
Figure 4.18: “No Delay” mode
4.3.5 High repetition rate
In normal use, there is a different acoustic wave for each diffracted optical pulse. This generally
prevents using the Dazzler
TM
with repetition rates higher than 1/T
Xtal
(time needed to refresh
the acoustic pulse in the crystal). For HR25 Dazzler
TM
systems, this limit corresponds to 30
kHz repetition rate.
It is however possible to run a Dazzler
TM
at higher optical pulse repetition rates, at the expense
of a lower pulse shaping capability and some small phase variations between consecutive pulses.
This mode is called “High Repetition Rate”, and is switched on automatically when:

1
RepRate
+ Trigger to Laser

≤ (T
p
+ T
Xtal
+ d
Min
) (4.4)
When “High Repetition Rate” mode is active, a blinking indicator appears in the upper right
corner of the Trig&Mode panel. The number of optical pulses diffracted for each acoustic cycle
is then shown in the N indicator. The graph along with its legend are updated (Figure 4.19).
Figure 4.19: ”High Repetition Rate” mode - (HR 25 Dazzler
TM
model typical values)
The acoustic cycle duration in this mode is given by :
τ
Ac
= N · 1/(Repetition Frequency ) (4.5)
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