Thorlabs LDC 400 , LDC 402 AND TED 420 Controller CardS Profile

The Thorlabs LDC400, LDC402, and TED420 controller cards deliver precise current and temperature regulation for laser diode and thermoelectric device management. The LDC series provides stable laser diode current control with constant current and constant power modes, while the TED series handles thermoelectric cooler temperature stabilization. These cards integrate to form complete solutions for laser module stabilization and thermal management in demanding photonics applications.

Technical Specifications

Laser Diode Control (LDC Series):

• Adjustable laser diode current up to 400 mA


• TEC drive output up to 2 A


• Control modes: Constant Current (CC) and Constant Power (CP)


• Photodiode monitoring with anode- or cathode-grounded configuration support


• Laser diode voltage measurement capabilities


• Analog monitor output for laser current Thermoelectric Control (TED Series):


• Designed for precise temperature regulation of thermoelectric devices


• TEC current output capability Protection and Modulation:


• Adjustable laser current limit


• Adjustable laser power limit


• Laser over-voltage protection


• Over-temperature protection


• Internal function generator for analog modulation


• External modulation input

Key Features

• USB interface with SCPI compliance


• Support for VISA drivers including LabWindows/CVI, LabVIEW, and MS Visual Studio


• Enhanced laser diode protection architecture


• Integrated laser and thermoelectric control for comprehensive thermal and optical stabilization

Typical Applications

• Laser module wavelength stabilization


• Noise reduction in optical systems


• Precision thermal management for laser diodes and detectors

Compatibility & Integration The LDC400, LDC402, and TED420 cards are engineered to operate as standalone units or integrated pairs, enabling coordinated control of laser current and temperature within single optical assemblies.