Spectra-Physics Tsunami - Cavity Alignment for FS Systems

Alignment
6-7
Figure 6-6: M
1
and M
3
Images Focused on the White Card
f. Move the M
3
translation stage until the vertically-oriented elliptical
image displayed on the card becomes focused.
Hold the M
3
translation stage in place and loosen its setscrew
(located over the dovetail slide, Figure 6-3). Carefully slide the
stage until the image becomes focused on the card (Figure 6-6),
then tighten the setscrew.
g. Adjust M
1
vertically and horizontally to overlap its reflected image
onto the centered elliptical image from M
3
.
h. Focus M
2
by moving its translation stage.
Adjust the
M
2
micrometer to focus the weak fluorescence reflected
from
M
1
as a horizontally elliptical image on the white card.
i. Remove the white card.
j. Verify the pump beam is still centered on the intracavity surfaces
of M
1
, M
2
and M
3
.
If it is not, repeat Steps 10 and 11 to recenter the beam on the intra-
cavity surfaces of M
1
, M
2
and M
3
.
This completes the alignment of the “front end.” If you are aligning a fs
laser, continue with the next section below. For a ps system, skip to “Cavity
Alignment for ps Systems,” which starts on page 6-14.
Cavity Alignment for a FS System
1. Turn the pump laser up to the nominal power found in Table 6-2
according to the optic set installed. Refer to Table 10-5, Table 10-6 and
Table 10-7 to correlate between optics and the optic set.
Table 6-2: Pump Power Requirements
Optic Set Pump Laser Pump Power (Watts)
Extra Long Millennia X 9 to 10
Blue
Millennia X
Millennia VIII
7 to 8
Millennia V 4 to 5
Standard, Mid., Long
and Broadband
Millennia X 8 to 9
Millennia VIII 7 to 8
Millennia V 4 to 5
Focused M
1
Image
M
3
Image
M
1
and M
2
Images Overlapped
2 – 3 mm