NEWPORT 505 Laser Diode Driver

The Newport 505 Laser Diode Driver is a precision current source engineered to deliver stable, low-noise output for driving laser diodes in demanding laboratory and industrial environments. This driver maintains exceptional current stability and accuracy while offering dual operating modes—constant current and constant laser power—to accommodate diverse application requirements. Built-in laser diode protection through redundant FET and relay shorting circuits, combined with independent current limiting, ensures device longevity. The driver supports external analog modulation across two bandwidth options and integrates a monitor photodiode for real-time optical feedback.

– Technical Specifications

Laser Current Control
• Output current range: 0–200 mA or 0–500 mA (505B model: up to 0.5 A)
• Output current accuracy: ±0.1% full scale
• Output current resolution: 0.020 mA (0–200 mA range), 0.050 mA (0–500 mA range), 0.004 mA (505B)
• 24-hour stability: <50 ppm full scale
• 1-hour stability: <10 ppm full scale
• Temperature coefficient: <50 ppm/°C full scale
• Compliance voltage: 7 V

External Modulation
• High bandwidth: DC to 660 kHz
• Low bandwidth: DC to 12 kHz
• Input impedance: 10 kΩ
• Analog input range: −10 V to +10 V
• Transfer function: 20 mA/V

Monitor Photodiode
• Monitor current range: 0–5 mA
• Monitor current accuracy: ±0.1% or ±0.05 mA
• Monitor current stability: 1.0 µA (24-hour)
• Photodiode current range: 0–5000 µA
• Photodiode current accuracy: ±0.1 µA or ±0.05 µA
• Photodiode current resolution: 1.0 µA
• Reverse bias capability: 0 to 5 V without external power

Noise Performance
• Low bandwidth output noise/ripple: <0.4 µA
• High bandwidth output noise/ripple: <1 µA

– Key Features

• Redundant laser diode protection with FET and relay shorting circuits
• Output on/off keyswitch with interlock control
• CDRH US 21 CFR 1040.10 compliant output delay
• Dual operating modes: constant current and constant laser power
• USB computer interface

– Physical Specifications

• Dimensions: 88 mm (H) × 215 mm (W) × 320 mm (D)
• Weight: 4.05 kg
• Power input: 100–120 VAC or 200–240 VAC, 50–60 Hz
• Operating temperature: 0 to 40°C
• Operating humidity: <90% non-condensing
• Storage temperature: −40°C to +70°C

– Typical Applications

Laser diode characterization, optical testing, fiber-coupled laser systems, and laboratory research requiring precision current control and optical power monitoring.