DazScope
manual
Chapter 2 : Installation
6. In case this folder is missing, copy and paste in this directory the appropriate ”
DS
” directory.
The ”
DS
” directory contains all the custom parameters required by the DazScope software.
To date, there are two sets of standards DazScope parameters,
DS-HR800
and
DS-WB800
which are located at
CDROM:\parameters_hoard\StandardParameters\DzScope
. Do not
forget to rename the suitable directory into
DS
.
7. Start the Dazzler software, and update the paths (In the Dazzler software: Monitor
>
maintenance
>
set paths).
8. Edit the file
C:\dazzler\paths.txt
and add a new line containing the text
params =
fol-
lowed by the path of the Dazzler parameters directory.
Exemple:
params = E:\DZSOFT\parameters_hoard\DB00-99\WB\db08wm29-v415
. Save the
file
C:\dazzler\paths.txt
.
The software is protected by a USB dongle. If the DazScope program is started without the
dongle, you get the message: ”SG-Lock not found, Program will stop. This is a FATAL error!
Program will exit.”
2.2
Dazzler setup
2.2.1
Beam Orientations
The angles indicated refer to the WB models. Note that the polarization and the direction of the
diffracted beam are different from the input beam. Make sure that the output polarization fits
your laser setup.
Input Optical Beam
Reflection on
the input face
Reflection on
the ouput face
14°
3.6°
1°
Diffracted
Beam
Direct
Beam
Acoustic
Wave
Te02
Crystal
Transducer
Adaptation
Circuitry
SMA Plug
Figure 2.1: Top View (laser pulse propagation from left to right). Input polarization is orthogonal
to figure plane. Diffracted beam is polarized in the diffraction plane (figure plane).
2.2.2
RF Generator Triggering
To trigger properly the Dazzler, you need to feed a TTL signal from the laser, with a rising edge
occurring
before
the laser pulse to be amplified enters the Dazzler crystal. This time interval must
correspond at least to the acoustic propagation time inside the crystal
. The triggering config-
uration varies with the experimental setup (10Hz, kHz lasers). Operational details are described
2
The acoustic propagation time depends on the crystal cut. For 25mm crystals, this is 31
.
6
µ
s for the WB cut,
and 40
.
6
µ
s for the HR cut.
FASTLITE-9 september 2008
