The Newport 505B is a precision laser diode driver delivering up to 500 mA output current at 7 V compliance voltage. Engineered for spectroscopy, fiber optic communications, and other demanding applications, it operates in constant current or constant laser power modes with dual current ranges for optimized resolution. External analog modulation from DC to 660 kHz (high bandwidth) or DC to 12 kHz (low bandwidth) enables dynamic control. Integrated photodiode monitoring and redundant safety circuits—including output keyswitch, interlock, and FET/relay shorting—protect the laser diode during operation.
Technical Specifications
Output Current
• Maximum: 500 mA
• Resolution: 0.004 mA (0–200 mA range); 0.01 mA (0–500 mA range)
• 24-hour stability: <50 ppm FS
• 1-hour stability: <10 ppm FS
• Noise/ripple (low bandwidth): <0.4 µA
• Noise/ripple (high bandwidth): <1 µA (0–500 mA: <1.5 µA rms)
• Current limit: 0 to full range + 1% of output
Compliance Voltage
• 7 V
Modulation
• Analog input impedance: 10 kΩ
• Analog input range: −10 V to +10 V
• High-bandwidth modulation: DC to 660 kHz (DC to 800 kHz)
• Low-bandwidth modulation: DC to 12 kHz
Monitoring
• Monitor current accuracy: ±0.05% FS (0–5 mA range)
• Monitor current 24h stability: 1.0 µA
• Photodiode current accuracy: ±0.05% FS (0–5000 µA range)
Temperature Coefficient
• <50 ppm FS/°C
– Key Features
• Dual operating modes: constant current and constant laser power
• Selectable current ranges optimize measurement resolution
• Transfer function: 20 mA/V
• Output on/off keyswitch with interlock and output delay
• Redundant FET and relay shorting circuits for laser protection
• USB interface for system integration
– Typical Applications
Spectroscopy, fiber optic communications, precision laser characterization.
– Compatibility & Integration
USB connectivity; Windows XP and Windows 7 (32-bit, 64-bit) software support. Input: 100–120 VAC or 200–240 VAC, 50–60 Hz. Operating temperature: 0 to 40°C; storage: −40°C to +70°C. Dimensions: 3.5 × 8.5 × 12.6 in. Weight: 4.05 kg.
