Tsunami - Beckman Institute Laser Resource Center

Tsunami
Opto-Mechanical Controls
All systems
to release the pressure on the latches, pull the top portion of the latch from
the notch in the cover. Perform the opposite to latch the cover.
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The following is a description of the opto-mechanical controls common to
both fs and ps Tsunami configurations. Refer to Figure 4-3 and Figure 4-4.
NOTE
The mirror control knobs are color-coded for easy identification: blue for
vertical, green for horizontal.
PI pump beam steering mirror-directs the input pump beam onto the center
of pump beam focus mirror PP. It has vertical and horizontal adjustments.
P2 pump beam focus mirror--directs the pump beam into cavity focus
mirror M3 and focuses the pump beam into the Tisapphire rod. It has vertical
and horizontal adjustments, and it sits in a dove-tail slide so that its
distance from the Ti:sapphire rod can be adjusted. A setscrew on the edge
of the slide holds it in place. The mirror is translated with respect to the
rod to create a uniform focused spot size in the rod and to compensate for
the difference in beam divergence among different pump lasers.
M2 and M3 cavity focus mirrors--center and focus the cavity beam waist -
in the Ti:sapphire rod. They have vertical and horizontal adjustments, and
their distances from the rod are adjustable: M2 has a micrometer adjustment.
M3 has a dove-tail slide that is held in place with a setscrew
(Figure 6-4).
M4 and M5 cavity fold mirrors-fold the beam and allow for a compact
laser. M4 directs the cavity beam to M5, and M5 directs it either to the AOM
(ps configuration) or Prl (fs configuration). In the Lok-to-Clock version,
the M4 contains the PZT for cavity length stabilization and has a short
cable and connector for plugging into the driver cable near it in the tray.
Both mirrors have vertical and horizontal adjustments.
AOM-is driven by the Model 3955 electronics module to insure proper
pulsing at start-up and, when the optional Model 3930 Lok-to-Clock
module is present, assists in synchronizing Tsunami pulses to another
source. The AOM has pitch and Bragg-angle controls.
Mlo output coupler (OC) --one of two cavity end mirrors. Whereas the
high reflector reflects all light back into the cavity, the output coupler allows
a small percentage to pass through as the output beam. Its vertical
and horizontal adjustments allow you to align the laser cavity and to optimize
output power and mode quality. These controls are available when
the laser head cover is in place.
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