5
ISOMET
3.5
Connect the USB to the host PC
3.6
Connect a voltage free contact to the -Enable SMA input.
3.7
Ensure the cooling water is on.
3.8
Apply + 24V DC to the amplifier
(The external trigger and clock inputs are not required for basic operation, depending on the
desired operating mode).
3.9
Adjustment of the RF output power is best done with amplifier connected to the acousto-optic
modulator.
The optimum RF power level required for the modulator to produce maximum first order
intensity will be different at various laser wavelengths. Applying RF power in excess of this
optimum level will cause a decrease in first order intensity (a false indication of insufficient RF
power) and makes accurate Bragg alignment difficult. It is therefore recommended that initial
alignment be performed at a low RF power level.
3.10
RF power is adjusted under software control
Please refer to the iMS SDK available at http://www.isomet.com/software.html
.
3.11
Set the power to a mid-level e.g.
Class Method description
Setting
UpdateDDSPowerLevel
80%
UpdateRFAmplitude Wiper
40%
3.12
Program the DDS for a constant signal; Freq=70MHz, Ampl=100%, Phase=0 degree.
This will operate the AO device at its mid-scan position
3.13
Align the deflector head to insure that the incident light beam is centred in the active aperture
of the deflector.
