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Manufacturer: Opt Lasers
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This driver designed to operate high power NIR laser diodes, including devices in series or stacked. It has a modulation bandwidth of 20 kHz. (Note that there is also a version with 5 kHz modulation bandwidth.) It can be used to operate 20, 40 or 60 W CS-mount 808 nm, 940 nm and 980 nm as well as other similar laser diodes.
With this laser diode controller, it is possible to power one or several laser diodes in series or one diode stack, which tend to have higher operating voltages. (Refer to the formula below for calculating PSU voltage.)
A separate laser diode supply voltage input and logic input voltage minimize the switch-on resistance of a power MOSFET. The inner layer of the heat sink is made of copper to better facilitate the transfer of heat. The outer body of a heat sink, machined from aluminum, is isolated from all signals on the driver including the ground. This allows mounting the driver directly to a metal heat sink if additional cooling is required.
The modulation input can be used as a TTL input with logic levels of 0 V and 5 V or as an analog (ANG) input. The analog modulation is linear over the range of 0 – 5 V. For example, if 2.5 V is applied to the analog input, the output current is 50% of the maximum current; 4 V results in 80% of maximum current, etc. Analog input allows for modulation of the current through the diode at a frequency up to 20 kHz. There are two potentiometers on the unit that can be used to set values of the maximum laser diode and DC bias (offset) current.
Included with the driver are connectors that can be used for the power supply and control inputs. M5 cap screws are also provided for attaching the laser controller to a mounting surface such as a heat sink. We can also supply an appropriate power supply unit. Please feel free to contact us with any questions.
This product contains is a current monitor output connection for measuring the current through the laser diode while it is operated. The output has a transfer function of 10 mV/1 A.
Recommendations and Requirements
The allowable supply voltage range depends on the number of laser diodes used in series, but it should be no higher than 3 V more than required by the laser diodes. For one laser diode having an operating voltage of approximately 2 V, the maximum PSU voltage should not exceed 5 V. For two diodes which operating voltage is around 4 V, maximum diode input is 7 V and so on. Therefore, the maximum input voltage is given by the formula:
VCC DIODE MAX = (Number of diodes in series) X (Each diode operating voltage) + 3 V
Always power the logic with 12 V before powering up the diode line. Because GND of the diode line and GND of the logic input are connected in the driver, always remember to connect GND of the diode line directly to the GND of a PSU.
Always use a high-quality power supply unit with low ripple voltage. It is suggested to add a large capacitor between the PSU is recommended, but it depends on PSU, wires cross-section and their length. The capacitor used for our tests was 10,000 uF / 25 V.
It is necessary to be careful when assembling not to cause a short circuit between the +VCC of the power supply and –GND of the logic input or monitor input. Doing so can cause the ground logic paths to be irreparably damaged.
Due to the high current through its components, we minimized the voltage drop of the driver and did not add reverse polarity protection. If this is a concern to customers, a protection device mounted close to the laser diode can be used.
The laser driver's body is isolated from all signals of the driver and can be mounted directly to metal heat sinks or other metal parts.
The analog input is protected by a 5V1 Zener diode on occasion there appears the voltage higher than 5 V. In spite of this, the input should not be used with higher voltages.
|Compliance Voltage||3 - 24 V|
|Current Monitor||10 mV / 1 A|
|Driver Mounting Hole Diameter||5,5 mm|
|Logic Supply Voltage||12 V|
|Max Ouptut Current||60 A|
|Max. Bias (DC Offset) Current||20 A|
|Max. Modulation Frequency||20kHz|
|Max. Power Dissipation||150W|
|Modulation Input Voltage Range||0 - 5 V|
|Mounting Hole Spacing||85 x 40 mm|
|Pre-Set Operating Current Setting||10 A|
|Softstart Time||2000 ms|
|Transistor Type Used||High power N-MOSFET|