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.
