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LDP-3840B pulsed laser diode drivers
Laser Diode Driver, Pulsed, 3A, 10V, GPIB, 120 VAC
In Stock
In Stock
LDP-3840B pulsed laser diode drivers
Laser Diode Driver, Pulsed, 3A, 10V, GPIB, 220 VAC
In Stock
In Stock


  • Laser Current
    3 A
  • Laser Compliance Voltage
    10 V
  • Computer Interfaces
  • Laser Current Resolution
    1000 µA
  • Laser Current Accuracy
    ±2.5% of FS
  • Duty Cycle
    0 to 10 %
  • Pulse Width
    100 ns to 10 ms
  • Pulse Repetition Rate
    1 μs to 100 ms
  • Rise/Fall Time
    <50 ns
  • Display Type
    4-digit Green LED
  • Weight
    3.6 kg


Precision Pulse Control for Laser Diodes

At the heart of the LDP-3840B is a precision pulsed current source that delivers clean pulses with low overshoot and fast rise and fall times. The 3840B’s low noise, transient-suppressed output is designed specifically for laser diode load levels. Digital control of pulse width, duty cycle and frequency provide quick and easy control of pulse parameters for maximum flexibility in varying test applications. For accurate monitoring of laser drive parameters in LIV applications, laser diode mounting boards are available with 50 ohm terminated connections for voltage and current monitoring.

Convenient Features Make Your Work Easier and More Reliable

The intuitive front panel of the LDP-3840B is designed for quick and easy instrument operation permitting precise pulse control. Pulse modes and parameters are logically grouped together without confusing multifunction keys allowing easy adjustment of pulse width, duty cycle and frequency. A selection of instrument operating modes includes pulse polarity, constant duty cycle and constant pulse repetition interval (PRI). In constant duty cycle mode, the set duty cycle is maintained while adjusting pulse widths. In constant PRI mode, the set pulse interval is maintained while adjusting pulse width. The bright 4-digit LED display is easy to view in laboratory environments. Precision digital tuning is easy with the front panel adjustment knob.

Setting the Standard in Laser Diode Protection

Laser diodes are extremely sensitive to electro-static discharge, excessive current levels, current spikes, or transients from power surges or other laboratory equipment. One of the most important features we have implemented into each instrument is the ILX Lightwave proven laser diode protection standards. These standards have led to advanced protection features such as current limits and output shorting circuits. In addition, during power up, the laser diode is protected from over current and turn-on transient conditions by a slow start routine designed to ramp the current to the desired set point referred to as slow-start. AC line filters and double shielded transformers provide further transient protection during laser operation. For more information about these protection features, please see our “Protecting Your Laser Diode" application note.

Pulse Tuning for Optimum Performance

The LDP-3840B offers a method to optimize the pulse response of the instrument to the laser diode load. By matching the source to load impedance at the laser diode through the addition of a small series resistance, unwanted parasitic effects can be compensated for to reduce ringing and overshoot on the pulse. In conjunction with the 3840B, ILX Lightwave has developed a laser mounting board to easily fixture the laser diode and to aid in tuning for optimal pulses.

Complete System Integration

Speed up data gathering with more repeatable, accurate control for automated testing and characterization of laser diodes with the GPIB/IEEE-488 interface. All instrument functions accessible from the front panel are also accessible through the GPIB interface. TTL level triggers are incorporated into the LDP-3840B to control output pulses and to initiate corresponding measurements from other instruments without a command program.

Selectable Pulse Polarity

Depending on the configuration of the laser diode under test, the LDP-3840B allows the output polarity to be quickly configured for either anode or cathode grounded devices from the front panel or through the GPIB/IEEE interface. The ILX Lightwave laser diode mounting board can be configured for either polarity with the laser correctly installed.