The Stanford Research Systems LDC501 Laser Diode Controller delivers precision current and temperature control for demanding laser diode applications. It combines a low-noise current source with a high-precision temperature controller, offering bumpless switching between constant current and constant optical power modes. Built-in protection features including adjustable current limits, compliance voltage control, and fast shutdown safeguard laser diodes during operation.
Technical Specifications
Laser Diode Current Source
• Output range: 0 to 500 mA
• Setpoint resolution: 10 µA
• Accuracy: ±0.01% of full scale
• Output impedance: >1 MΩ (DC)
• Thermal stability: <10 ppm/°C
• Short-term stability (1 hr): <5 ppm full scale
• Long-term stability (24 hr): <15 ppm full scale
• Current noise: 1.5 µA rms to 4.5 µA rms depending on bandwidth selection
• Analog modulation: 0–10 V input, 500 kHz bandwidth (1 MHz in CC mode)
• Digital modulation: TTL compatible, 2 MHz bandwidth
• Photodiode bias: 0 to 5 V, programmable
Temperature Controller
• TEC power output: 36 W
• Temperature resolution: 0.001 °C
• Accuracy: 0.01 °C (with calibrated sensor)
• Stability: 0.0005 °C/°C with respect to room temperature
• Supported sensors: Thermistor, RTD, IC sensors
• Auto-tuning: PID loop optimization included
– Key Features
• Constant current (CC) and constant optical power (CP) modes with bumpless switching
• Constant temperature (CT) and constant current (CC) modes for TEC control
• Slow start turn-on and fast clamping shutdown
• Adjustable current limits and compliance voltage
• Over-temperature shutdown protection
• TTL trigger input
– Interfaces & Integration
• GPIB (IEEE-488), RS-232, and Ethernet remote control
• Nine non-volatile configuration save/recall slots
• 19″ rack-mount, 2U form factor
• 100–240 V AC, 50/60 Hz; supports 100V, 120V, 220V, 240V nominal operation
• Weight: 8.5 lbs (3.9 kg)
