Tsunami Mode-Locked Ti:sapphire Laser
8-8
5. If you are going to use the 80 MHz internal reference, attach the short
BNC cable from the accessory kit between the 80 MHz OUT and REF IN
connectors on the rear panel of the Model 3930. If, instead, you are
using an external reference to monitor another laser (e.g., the output of
a Model 3932), verify the output is 0 dbm into an 50 Ω termination
(0.63 V
pp
) for the REF IN input, then attach a BNC cable from the sig-
nal source to
REF IN.
6. Verify the voltage and fuse rating of the Model 3930 are correct.
They are a part of the power switch assembly on the rear panel. Refer
to Appendix C for instructions on how to change the setting and the
fuse.
7. Connect the power cord from the Model 3930 power connector to your
facility power outlet.
8. Verify the pump laser shutter is closed or that the laser is not on, then
open the Tsunami laser head.
For information on how to open the laser head, refer to Chapter 5,
“Installation: Installing the Tsunami Laser Head.”
9. Remove the standard, non-PZT M
4
mirror by unscrewing it from its
mount (Figure 6-8).
10. Install the PZT-controlled mirror that is provided with the LTC system
into the M
4
mount, then attach its short cable to the mating cable laying
in the tray near it.
11. Open the pump laser shutter and adjust the horizontal and vertical con-
trols of M
4
to get the Tsunami lasing again and to optimize output
power.
12. Optimize laser output again by adjusting
M
10
and M
1
.
This completes the standard installation of the Lok-to-Clock system. Before
you proceed with the next section on operating the Lok-to-Clock system,
verify you have complied with the instructions for general operation in
Chapter 7.
Operation Notes
Please note that the front panel controls on the Model 3930 work in parallel
with the optional RS-232 SCPI interface on the back panel. Whenever you
change a setting with one interface, the other is affected as well; there is no
switch to change from one command source to the other.
The following sequences for start-up and shut down are appropriate for
both command sources but are written with the front panel in mind. Simply
adapt these commands accordingly when using the
SCPI interface. Refer to
“The Lok-to-Clock Computer Interface” section later in this chapter for
information on setting up and using the SCPI interface.
Whenever this BNC cable is removed, the 50 Ω terminator must be
reconnected to prevent oscillation of the photodiode gain circuit.
Caution!
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