Laser Diode Driver LD8000
12
Ver. 1.0
Current card
Figure 9. Current card
First of all the
Modulation
method and source should be set (see chapter 4.3 Laser modulation
modes). This can be done either with the small arrows right to the word Modulation, or by
clicking the picture and choosing the corresponding pictogram from poped up table. According
to the modulation method, other controls of this tab are activated or deactivated.
Here you also can set the
Maximum Voltage
of the laser diode. If this value is achieved, the
laser turns off automatically and the LD Voltage Error indicator (green, rectangular) lights up.
The
Gate Mode
is available in modulation modes with internal pulse generation. See chapter 4.3
Laser modulation modes for details.
Constant output power can be achieved, when a photodiode is used to measure the intensity of
the output. The device measures the voltage at the photodiode and converts it to a digital value,
called Photo Diode Signal. When you click on
Hold Actual Power
, the Current target will be
tracked to hold the Photo Diode Signal at a constant value. Please note that for activating
constant power mode, the Photo Diode Signal reception should be enabled (green round button).
The fields
Frequency
and
Duty Cycle
are just indicators and are calculated from the values of
Width
and
Period
.
