Tsunami Mode-Locked Ti:sapphire Laser
1-2
with low timing jitter and/or to be synchronized to another mode-locked
source or to another Tsunami laser.
The Model 3910 purge unit filters, dries, and regulates the flow of nitrogen
gas into the sealed laser head to purge dust and water vapor from it. For
performance stability, the chiller maintains the Ti:sapphire rod at a constant
temperature by removing heat that is generated in the rod from pump beam
absorption.
The Tsunami system includes dust tubes to enclose the pump beam path for
improved performance and for personal safety. Also included are a tool kit,
a separate box for the
GTI (if you ordered a ps system), and a box for the
PZT M
4
mirror (if you ordered the optional Lok-to-Clock system).
System Configurations
The Tsunami is available in several configurations, several of which can be
upgraded so they can be converted from ps to fs, or vice versa, or be con-
verted for use with the Model 3930 Lok-to-Clock system. While some can
be purchased ready for field conversions, most require the initial upgrade
work be performed at an authorized Spectra-Physics service facility. Call
your Spectra-Physics service representative if you have upgrade questions.
The following models are ps-only systems:
• Standard configuration Model 3950
• Lok-to-Clock Model 3950C
• Lok-to-Clock upgradeable Model 3950D (i.e., it is shipped without the
Model 3930 electronics module or the
M
4
PZT mirror)
The following systems are fs-only systems:
• Standard configuration Model 3941
• Lok-to-Clock Model 3941C
• Lok-to-Clock upgradeable Model 3941D (i.e., it is shipped without the
Model 3930 electronics module or the M
4
PZT mirror)
The following systems can operate either as ps or fs systems:
• Standard configuration Model 3960
• Lok-to-Clock Model 3960C
• Lok-to-Clock upgradeable Model 3960D (i.e., it is shipped without the
Model 3930 electronics module or the
M
4
PZT mirror)
Conversions
Tsunami picosecond and femtosecond lasers are inherently different, and
various mounts, components, and optics must be changed when converting
them from ps to fs operation, or vice versa. These two systems differ in the
following ways:
*
• the transmission of the output coupler.
• the method of wavelength selection: a birefringent filter (bi-fi) for ps
versions and a slit for fs versions.
*
These components and differences are discussed in Chapter 3, “Laser Description.”
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