Tsunami - Beckman Institute Laser Resource Center

Alignment
Refer to chapter 7, "Operation: Mode Locking the Laser."
23. Adjust MI and MI0 for maximum output power.
Ensure that ion laser pump power is at optimum setting.
Converting Between Overlapping Optics Sets
DANGER: LASER RADIATION
This procedure requires you to replace optics while using the laser at
high power. For safety, close the pump laser shutter every time you
change an optic, and only open it during alignment. Protect yourself
with appropriate eyewear at all times.
CA UTlON
Always use clean finger cots or powderless gloves when handling optics.
WA RNlNG
Tsunami should meet specified power for the installed optic set before
changing optic sets. Refer to chapter 7, "Operation: System Start-up,"
and to the specifications listed in Table 3-1 and Table 3-2.
To change between overlapping wavelength ranges, follow the same
procedure outlined under "Converting Between Non-overlapping Optics
Sets" above. However, note the following:
1. Before making the conversion, tune the laser to a region overlapped
by the two optic sets, and optimize laser output. Refer to the tuning
curves in chapter 3.
2. During each adjustment following the installation of an optic, instead
of only verifying that the cross-shaped fluorescent image is visible on
the white card, adjust the optic to get the system lasing. Once lasing,
adjust just that optic for optimum output. Do this for all optics except
mirror MS. M3 is changed last.
3. When M3 is replaced, place a white card in front of M5, and adjust P2
to overlap the two fluorescent ovals so they form the cross-shaped
image. Then remove the white card and adjust M3 until the system
lases.
4. Verify the laser beam is centered on MI to M5, as well as MI0. Adjust
photodiode pc board if required (refer to earlier section on pc board
alignment).