ILX Lightwave CSM-39050: 4-CH Laser Diode Current Source Module

The ILX Lightwave CSM-39050 is a 4-channel laser diode current source module engineered for precision control and modulation of laser diodes within the LDC-3900 Modular Laser Diode Controller platform. Each module installs into any of the four rear-loading bays and operates with full electrical isolation from other installed modules. The CSM-39050 delivers stable, accurate current drive for independent laser diode operation across research, development, and production environments.

## Technical Specifications

**Current Source Performance:**
• Output current range: 0.00 to 500.00 mA
• Set point accuracy: ±400 µA
• Set point resolution: 4 µA
• Current limit range: 0 to 500 mA with 2 mA resolution
• Compliance voltage (fixed): 6.5 V maximum
• Temperature coefficient: <60 ppm/°C
• Stability (1 hour): <20 ppm
• Stability (24 hours): <40 ppm

**Output Noise & Ripple:**
• High bandwidth mode: <5 µA rms (DC to 200 kHz)
• Low bandwidth mode: <3 µA rms (DC to 5 kHz)
• CW mode with 320 cable: <1.5 µA rms (DC to 30 Hz)

**Photodiode Feedback:**
• Range: 5 to 5000 µA
• Output stability: ±1 µA
• Accuracy: ±2.5 µA
• Bias voltage: 0 to 5 V reverse bias (±10%, adjustable)
• Current resolution: 1 µA
• Current accuracy: ±2 µA

**Display & Readout:**
• Laser drive current: 0.00 to 500.00 mA with 0.01 mA resolution (±0.1% FS @ 25°C)
• Optical power: 0 to 500.00 mW with 0.1 mW resolution
• Responsivity: 0 to 600.00 µA/mW with 0.01 µA/mW resolution
• 5-digit green LED display

## Key Features

• Four independent current source channels with electrically isolated outputs
• Dual-mode bandwidth selection for optimized noise and response characteristics
• Integrated photodiode feedback loop with calibrated responsivity control
• GPIB/IEEE-488.2 interface for remote programming and automated control
• 9-pin D-sub output connector

## Compatibility & Integration

The CSM-39050 installs directly into the LDC-3900 controller. All four module bays accept this current source interchangeably with other LDC-3900 compatible modules. Each channel operates with complete electrical isolation.

## Environmental

• Operating temperature: 0 to 40 °C
• Storage/transportation temperature: -40 to 70 °C
• Maximum humidity: <80% RH (non-condensing)
• Maximum altitude: 3000 m