Tsunami Mode-Locked Ti:sapphire Laser
9-12
Beam Splitter
Because the beam splitter is outside the cavity and covered by a housing,
and because the laser head is sealed and purged, it is unlikely the beam
splitter will require cleaning. We urge you to refrain from doing so.
1. Close the pump laser shutter.
2. Remove the beam splitter by unscrewing its holder from the mount
(Figure 9-4).
3. Remove the optic from its holder, and follow Step 2 of “General Pro-
cedure for Cleaning Optics” to clean both sides.
4. Install the optic in its holder (either side can face upward), and screw
the holder back into place. Take care not to cross-thread the holder.
5. Because the beam splitter is wedge-shaped (i.e., there is a natural
beam offset, but the direction is unknown), the photodiode pc board
might require realignment. Refer to Chapter 6, “Alignment: Aligning
the Photodiode PC Board.”
6. Open the pump laser shutter.
Routing Mirrors
Because the routing mirrors are outside the cavity and are enclosed, it is
unlikely they will require cleaning unless the dust tubes are removed for a
long period of time. Cleaning them is easy. Refer to Figure 5-2.
1. To access the mirror, unscrew the two screws on top of the unit and
remove the cover.
2. Clean the mirror in place using a folded tissue and hemostat as
described in Step 3 of “General Procedure for Cleaning Optics.”
3. Replace the cover and the two screws.
Replacing Filters in the Model 3910 Purge Unit
The schedule for replacing the filters and dryer/sieve assembly depends on
the amount and quality of purge nitrogen used. Change all three filters
(Figure 9-5) when the blue desiccant in the sieve assembly turns pink. In
some areas, the indicator dye in the desiccant is considered a hazardous
material. Consult your materials manager and/or local government environ-
mental agency for guidelines on proper disposal methods. Refer to the
Material Safety Data Sheets in Appendix D for information on the materi-
als contained in these filters.
Part numbers for filters are listed in Table 11-3, “Model 3910 Purge Unit
Filter Hardware.”
To replace the filters and sieve assembly:
1. Turn the unit upside down with the flow gauge facing away from you,
and remove the small screws (2) on the side nearest you.
2. Disconnect the filter assembly from the flow gauge and output port.
Press in on the connector spring-clips and pull out the hoses.
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