High Power Current Controllers


High Power Laser Diode Controllers

  • Control Currents up to 5 A or 20 A
  • Excellent Current Stability and Accuracy
  • Continuous Wave or Quasi-Continuous Wave Operation
  • USB Interface (SCPI)

Laser Diode Controller Features

  • Two Models for 5 A and 20 A Laser Currents
  • Operate with Anode- or Cathode-Grounded
    Laser Diodes and Photodiodes
  • Also Capable of Driving LEDs in CW
  • Continuous Wave or Quasi-Continuous Wave Operation
  • Internal Function Generator for Analog Modulation
  • External Modulation Input
  • Analog Monitor Output for the Laser Current
  • Laser Diode Voltage Measurement
  • Power Efficient by Active Power Management
  • Compatible Optical Detectors:
    • Photodiodes
    • Thermopiles
    • Sensors with Amplifier
    • Power Meters
  • Control Modes:
    • Constant Current (CC)
    • Constant Power (CP)
  • Enhanced Laser Diode Protection Features:
    • Adjustable Laser Current Limit
    • Adjustable Laser Power Limit
    • Laser Over-Voltage Protection
    • Over Temperature Protection
  • Interface and Drivers:
    • USB Interface (SCPI compliant)
    • VXIpnp/VISA Drivers for all Common Programming Environments like LabWindows/CVI™, LabVIEW™, and MS Visual Studio™

The LDC4000 Series of Laser Diode Current Controllers provide precise and stable current for driving high-power laser diodes with injection currents up to 20 A. This series supports all laser diode and monitor diode pin configurations and features a constant current or constant power mode. The series is designed for stand-alone operation and is controlled via front panel keys and intuitive operation menus on a large and easy-to-read graphic LC display. See the Display Screens tab for some examples. Additionally, the LDC4000 Series can be fully remote controlled via an SCPI compatible USB Interface. A higher setting resolution and measurement resolution is offered via remote control.

Compared to the LDC200C Series, the LDC4000 Series offers higher injection currents as well as additional features like the Quasi-Continuous Wave (QCW) operation mode, an internal modulation generator, a thermopile input, laser voltage measurement, and an optical power limit. These features, together with the new design, which offers silent and efficient operation, make the LDC4000 Series Laser Diode Controllers an ideal choice for most applications.

For more information about the constant current and constant power modes, the photodiode and thermopile monitor inputs, the continuous wave (CW) or quasi-continuous wave (QCW) operation and the enhanced protection features for the laser diodes please see the More Info tab.

Companion Products

The TED4015 TEC Controller is the ideal companion for the LDC4000 Series Controllers. When combined with our TEC laser mounts, the TED4015 can achieve a thermal stability of 0.001 °C. This temperature stability is required for applications like diode laser wavelength tuning and atomic absorption cell spectroscopy.


Item #LDC4005LDC4020
Laser Current Control Range 0 to 5 A 0 to 20 A
Compliance Voltage 12 V 11 V
Photocurrent Measurement Ranges 2 mA / 20 mA
Power Monitor
Voltage Measurement Ranges
10 mV / 100 mV / 1 V / 10 V
QCW* Pulse Width Range 100 µs to 1 s
QCW* Repetition Rate Range 1 ms to 5 s (0.2 to 1000 Hz)
Internal Modulation Waveforms Sine, Square, Triangle
Internal Modulation
Small Signal Bandwidth
20 Hz to
100 kHz
20 Hz to
50 kHz

*Quasi-Continuous Wave


Laser Diode Connector Cables

Item # CAB4005CAB4006CON4005
  CAB4005 CAB4006 CON4005
Description Standard Laser Diode Cable High Current Laser Diode Cable 13W3 Male and Female
Connector Kit (One Each)
Max Current 5 A 20 A 20 A
Connector Type 13W3 Male to DB-9 Male 13W3 Male to 13W3 Male Loose 13W3 Connectors,
Male and Female

These cables connect our LDC4000 series current controllers or our ITC4000 series dual current / temperature controllers to laser diodes. We also provide loose 13W3 connectors for customers who wish to make their own cables.

Please note that one CAB4005 cable and one CON4005 connector set are included with the purchase of an LDC4000 series benchtop controller.


Our Mission is to accelerate the advancement of optical technology for precision measurements and their applications from the table tops of research laboratories to standard use in communication and high technology industries. Our aim is to serve our customers. Our hope is to create a place for highly skilled people in an open environment

contact us

Tel               +966 35823441
Fax               +966 35823441
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