Spectra-Physics Tsunami - Input Bezel Connections; Control Panel

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Tsunami Mode-Locked Ti:sapphire Laser

4-2

Input Bezel Connections

The input bezel connections attach to the Model 3910 purge unit (optional

on the Model 3941), the chiller, the optional Model 3930 Lok-to-Clock

electronics module, and the standard Model 3955 electronics module. Refer

to Figure 4-1 or Figure 4-3.

Purge bleed valve—when open, allows more purge gas to flow through the

laser head during initial start-up. It is closed for normal operation.

Water inlet connector—input for the laser rod cooling water from the

chiller.

Water outlet connector—output for the laser rod heated water to the

chiller.

Purge inlet connector—inlet for clean, dry gas from the Model 3910.

LTC PD photodiode BNC connector—sends the reference photodiode sig-

nal to the phase detector circuit in the optional Model 3930 Lok-to-Clock

electronics module. If the latter is not present, a 50 Ω terminator must be

attached.

TO 3930 main signal D-sub connector (25-pin female)—sends and

receives signals to and from the optional Model 3930 Lok-to-Clock elec-

tronics module.

TO 3955 main signal D-sub connector (25-pin male)—receives heater,

power, and control signals from the Model 3955 electronics module.

ML PD photodiode BNC connector—sends the reference photodiode sig-

nal to the acousto-optic modulator (AOM) driver in the Model 3955 elec-

tronics module.

ML mode locker BNC connector—receives the AOM RF signal from the

electronics module.

Control Panel

The laser head control panel indicates whether or not pulses are detected,

and shows the temperature status of the mode locker. For ps systems, it also

provides

GTI temperature status and dispersion control for the GTI (Figure

4-2). This panel is not present on the Model 3941.

PULSING indicator—when green, it indicates either pulses are present or

conditions are correct for pulses.

MODE LOCKER TEMPERATURE indicator—when green, it indicates

mode locker temperature has stabilized; red indicates the opposite. From a

“cold” laser start-up, expect a stabilization time of about 20 minutes.