Tsunami - Beckman Institute Laser Resource Center

Tsunami
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3930
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Figure 5-6: Photodiode PC Board
There are two sinewave photodiode output signals, one for the Model
3955 Tsunami electronics module and one for the Model 3930
Lok-to-Clock electronics module. Because these signals have different
amplitudes, it is important that the pc board connectors are
attached to their respective BNC connectors on the input bezel.
Note: If you do not use the optional Model 3930, the LTC PD connector
must be terminated with a 50 SZ terminator to prevent improper
functioning of the mode locker feedback loop.
5. Venfy the external rf and photodiode coaxial cables and the main signal
cable between the Model 3955 electronics module and the laser
head are properly connected. If you have any doubt, refer to "Installing
the Tsunami Model 3955 Electronics Module" earlier in this chapter.
CAUTION
It is critical to the performance of the system (and ease of installation)
that you use the rf and photodiode BNC cables provided. The system
was calibrated for the type and length of these cables to provide proper
phase matching between the photodiode and mode locker signals. If rf
andfor photodiode cables other than those shipped with Tsunami are
used, an adjustment for cable length is required. Refer to chapter 6,
"Alignment: Coarse Phase Adjustment ..."
6. Install the plastic cover over the laser head pc board.
This completes the Tsunami and pump laser installation. If you have a
Lok-to-Clock system, refer to chapter 8 for installation and operating
instructions.