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