Tsunami - Beckman Institute Laser Resource Center

I II I j Irl Ill lli Ill I t I I LJ I 1 I ULI I I
Operation
Description
Ion Laser Power
Slit Width
Operating in the Broad Picosecond Regime
Tsunami System Verification
Typical Setting
7 - 9 Watts
1.5 - 2.0 mm
Typically, the pulse width can be varied with these controls by a
factor of 2 to 3.
The Tsunami laser is capable of producing pulses in the range 2 - 80 ps by
using special GTIs and either a 2- or 3-plate bi-fi.
Verify the following before you start the conversion process for broad
pulses:
Conversion for Long Picosecond Operation
1. Verify the coarse and fine PHASE settings on the Model 3955 are
correct.
Refer to chapter 6, "Alignment: Coarse Phase Adjustment ...," for
information on setting the coarse and fine PHASE controls.
2. Verify the beam is centered on Mlo and output power is optimized.
If the beam is not centered on Mlo, refer to "Optimizing Laser
Output" earlier in this chapter to "walk the beam" and recenter it on
M1 and Mio.
1. Install the correct bi-fi filter assembly.
Refer to Table 7-1 and to chapter 6, "Alignment: Selecting, Installing,
and Aligning the Birefringent Filter."
2. Replace the MI HR with the appropriate GTI.
Refer to chapter 5, "Installation: Installing the GTI."
3. Adjust M2 vertically and horizontally to center the beam on the GTI.
4. Adjust the GTI vertical and horizontal controls to optimize output
power.
5. Install the special matching network assembly in series with the AOM
for systems with pulse width capability over 10 ps.
The network assembly is a small box with an SMA connector on one
end and short cable on the other. The cable end attaches to the AOM.