DAZZLER
TM
system manual Part I : installation & operation 4.3
WB25 model WR25 model HR25 model
TXtal (µs ) 23.60 29.80 32.66
Table 4.1: typical values of TXtal
(a) Button
(b) Contextual menu
Figure 4.11: Repetition Frequency adjustment helpers (WR25 Dazzler
TM
typical values)
4.2.3 Trigger to Laser adjustment procedure
As shown in section 4.1 and section 4.2, the precise synchronization of the acoustic with the
optical wave requires that the Trigger to Laser value be adjusted with the same accuracy. The
following steps explain how to proceed.
1. Set Trigger to Laser to the value corresponding to the setup. If necessary, measure it
with a photodiode and an oscilloscope.
2. If working in Trig on Previous mode, adjust Repetition Frequency to the value corre-
sponding to the setup.
3. Send the diffracted beam to a spectrometer (REMINDER : amplifiers should not be used
until the Trigger to Laser value is correctly adjusted.).
4. Set the phase option to polynomial and the ”order 3” and ”order 4” to zero. Use the
”delay” dial to center the signal on the time graph.
5. Increase the second order phase coefficient (”order 2”) until the signal covers the full
window on the software time graph (Figure 4.12).
6. Measure the diffracted spectrum.
7. Increase the Trigger to Laser value until the measured spectrum is truncated. Then,
decrease the value until the measured spectrum is truncated again.
8. Set the Trigger to Laser value to the mean of these two values.
9. Re-check that the diffracted spectrum is not truncated.
V3.00 - 8
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