The ILX Lightwave LDC-3900 is a 4-channel modular laser diode controller delivering independent, isolated control and monitoring of laser diodes and thermoelectric coolers across research, development, and production environments. The instrument accommodates four rear-loading module bays configured with laser diode current source modules (20 mA to 8 A maximum output), TEC modules (up to 32 W), or combination current source/TEC modules (up to 2 A current source with integrated temperature control). Each channel operates with fully isolated, electrically floating modules to eliminate ground-loop damage, supported by transient detection circuits, keyswitch control, interlock protection, and output delay to meet CDRH US21 requirements.
## Technical Specifications
**Architecture & Channels**
• 4 independent, isolated channels
• 4 rear-loading module bays
• Vacuum Fluorescent Display
**Laser Diode Current Source Modules**
• Maximum output range: 20 mA to 8 A (module-dependent)
• Available modules: CSM-39020 (20 mA), CSM-39050 (50 mA), CSM-39100 (100 mA), CSM-39200 (200 mA), CSM-39400 (400 mA), CSM-39800 (800 mA)
• Constant Current and Constant Power operating modes
• Direct modulation capability up to 500 kHz
• Short-term stability: < 20 ppm
• Analog modulation for wavelength tuning via current dithering
• Independent current limits, slow-start circuits, and isolated power supplies
**TEC Modules**
• TCM-39032: 32 W output, 8 V, 4 A
• Constant Temperature and Constant Resistance operating modes
• Temperature sensor compatibility: thermistor, IC, and RTD
• Stability: better than 0.005°C
• Temperature display resolution: 0.01°C (with calibration constants)
• Smart integrator control for fast settling
**Combination Modules (Current Source + TEC)**
• Integrated TE temperature controller with current source up to 2 A
• Control up to four packaged lasers simultaneously
**Protection & Safety**
• Fully isolated modules to prevent ground-loop damage
• Transient detection with automatic output shutdown
• Keyswitch, interlock, and output delay control
• CDRH US21 compliance
**Control & Interface**
• GPIB/IEEE-488.2 interface for remote programming and readout
• LabVIEW driver available
## Key Features
• High-resolution control with low-noise performance
• Modular architecture enabling custom channel configuration
• TEC stability exceeding 0.005°C for precision temperature management
• Direct modulation to 500 kHz for dynamic wavelength and power control
• Multiple laser protection topologies integrated into module design
## Typical Applications
Laser characterization and stabilization, wavelength-tunable laser systems, multi-channel test automation, packaged laser module validation, research and development photonics systems.
## Compatibility & Integration
The LDC-3900 accepts interchangeable current source and TEC modules, enabling users to scale system capability from single-channel to four-channel configurations. GPIB control and LabVIEW drivers facilitate integration into automated test environments.
