ILX Lightwave LDX-3412 – Laser Diode Driver, 200mA

The ILX Lightwave LDX-3412 is a precision laser diode driver delivering stable, low-noise current control up to 200 mA for laser diodes and LEDs. This bench instrument combines constant current and constant power modes with comprehensive laser protection circuitry, offering ±0.2 mA accuracy and output current drift below 50 ppm over 30 minutes. Built-in photodiode feedback enables closed-loop light-level regulation, while adjustable current limiting, slow-start circuitry, and semiconductor output switching protect sensitive optical devices during connection and operation.

Technical Specifications Output Current

Range: 0–200 mA

Accuracy: ±0.2 mA

Resolution: 100 µA (laser current); 10 µA (setpoint)

Drift (30 min, constant current): <50 ppm typical

Broadband noise (low bandwidth): <0.01% rms; 2 µA typical

1 hour stability: <50 ppm Operating Modes

Constant Current: up to 200 mA at 6 V maximum

Constant Power: photodiode-feedback regulation for stable optical output

Current Limit Display mode Photodiode Feedback

Input range: 20–2000 µA

Bias supply: 0–5 V

User-adjustable feedback control Temperature Performance

Coefficient: <100 ppm FS/°C

Operating range: 0–50 °C

Storage range: –40–70 °C Power Supply

Input: 100–240 VAC, 50/60 Hz

Max consumption: 30 W

Warm-up: 1 hour to rated accuracy; 2 hours for stability

Key Features

Semiconductor output switch shunts terminals when powered off - safe laser connection/disconnection without transient spikes

Adjustable current limit independent of setpoint

Slow-start circuit prevents abrupt turn-on transients

AC line transient filters and double-shielded transformer suppress line noise

3.5-digit green LED display with intuitive front-panel controls

User-adjustable system interlock via internal jumpers

9-pin D-sub laser output connector; standard banana jack for chassis ground

Typical Applications Precision current control for laboratory and manufacturing environments where stable, low-noise performance and component protection are essential. Suited for low-power butterfly and TO-can packaged laser diodes requiring either fixed-current or optical-feedback regulation.

Compatibility & Integration Works with a wide variety of precision laser diode mounts and optical packages. Compact benchtop form factor (140 mm W × 267 mm D × 66 mm H; 1.8 kg) integrates into test racks and laboratory setups without computer interface or external control hardware.