Datalogic Arex 400, Руководство пользователя

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MOPA FIBER LASER
122
AREX™ 400
For the longer pulse profiles (above 20 ns), the pulse shape varies with pulse frequency
and Power level. Below the pulse transition frequency (fT), the pulse profile shape will
remain invariant, i.e., will not vary with pulse frequency, while above fT the shape will
vary with pulse frequency. Increasing the pulse frequency and/or decreasing the Power
level will make the pulse shape less “leading peak” like and more “square” like.
The following pictures illustrates for some typical Pulse Profiles, the pulse shape varia-
tion in the “Constant Average Power Region” and the “Constant Energy/Peak Power
Region”.
Figure 4: Typical optical output pulse shape in the “Constant Average Power Region” at
200kHz (left) and the “Constant Energy/Peak Power Region” at 20kHz (right)
If operating below transition frequency (fT), the user can vary the pulse energy without
any other setting change (namely Peak Power) by changing the Pulse Profile selected.
If operating above transition frequency (fT), the user can vary pulse peak power without
changing pulse energy by changing the Pulse Profile selected.