10
How to use the internal HV-DC Supply
The LDP-V series provides a high power (up to 15 W / 1 A / 80 V) internal high voltage
supply. To adjust the laser diode current to the desired value follow the steps below.
Note: Make sure that the solder junction is done to activate the HV-DC supply.
1.
Turn the poti fully counterclockwise
2.
Apply the 15 .. 24 V supply voltage
3.
Start pulses
4.
Measure the diode current
5.
Adjust the level of the high voltage supply (hence the level of the current) by
turning the poti clockwise
Security Advice:
Do not touch any leads of the output or the output capacitors as they are connected to a
high voltage of up to 80 V.
Pulse Output
The LDP-V series provides ultra rapid pulse rise and fall times in the region of several
nanoseconds. However, pulse rise and fall depend on the parasitic stray inductance of the
cabling to the laser diode. Direct connection without any kind of wires to the module is
absolutely necessary for best results. For detailed information about the effect of the laser
diode connection on the pulse shape please refer to PicoLAS Application Notes
“Impedance of Diodes” and “LD-Connections”.
Typical pulse rise and fall times of LDP-V 03-100 (scale: 1 A/Div)
Trigger Input
The trigger input, both on the pin header and the SMC jacket, is terminated with 50 Ohm
to ground. The trigger source has to be able to provide a signal level of 5 V with a 50 Ohm
load.
Summary of Contents for LDP-V 03-100 V4.0
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