
6
Operating Modes
The PLCS-21 can be operated in two different ways: as a controller for a compatible
PicoLAS diode driver and as a stand alone digital function generator. If used as a
controller it supports the voltage mode and the current mode, otherwise the frequency
generator mode. In either mode a number of trigger modes and thee different control
interfaces are supported. See section 6 for a detailed description of the trigger modes and
sections 7 and 8 for the control interfaces.
Using the PLCS-21 as a Control Unit for a Laser Diode
Driver
First of all the PLCS-21 must be mounted on the laser diode driver by using the two
connectors on its bottom side and three screws M3 x 8 mm. PLCS-21 and the diode driver
are both powered by a single 15 V power supply via connector 1. Then a PLB-21 or a PC
with appropriate software must be connected to the PLCS-21. Now the PLCS-21 is ready
for use.
Important: Connector 3 must never be connected to any cable if the PLCS-21 is
mounted on a diode driver. Anything else can result in deformed laser pulses.
Though monitored by the PLCS-21 the power being fed into a laser diode may
exceed the adjusted value and can in some cases destroy your diode. Correct
operation is guaranteed only if connector 3 is left unconnected.
Furthermore, the connected diode driver must use its internal high voltage source.
See device specific datasheet for instructions how to enable the internal HV source.
Voltage Mode
This mode is active by default once a driver is connected to the PLCS-21. The pulse
width, repetition rate, voltage, temperature monitor and overcurrent detection of the
connected driver can be set. In Voltage Mode it is also possible to carry out a calibration.
See section “Calibration” for details. When it is done, a change to Current Mode can be
carried out.
Current Mode
When the calibration is successfully completed, a change to Current Mode can be carried
out. Now, in addition to the voltage, the current can alternatively be set. These two
parameters are linked together in such a way that a change to the set current always
generates a change to the voltage. The minimum value for the voltage is specified by U
min
;
the maximum value for the current is specified by I
max
. The interdependency of both
values is determined during calibration and is stored in the PLCS-21.
If another diode is connected to the driver or another driver is connected to the PLCS-21
the calibration must be manually repeated. A change of the diode or the driver (with the
same type) cannot be detected by the PLCS-21. If the values of U
min
or I
max
change, this
also means that a new calibration must be carried out in order to take the new limits into
account.
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