The Stanford Research Systems SR474 is a four-channel laser shutter driver that provides independent control of up to four SR470 Series shutter heads. Built for precision optical experimentation, it combines manual front-panel control, external TTL triggering, and remote command interfaces (GPIB, RS-232, Ethernet) in a single instrument. The system minimizes vibration and mechanical noise to preserve optical table stability while delivering microsecond-level timing precision.
Technical Specifications
• Channels: Four independent shutter drivers
• Compatible Shutter Heads: SR475 and SR476 (SR470 Series)
• Shutter Blade Material: Beryllium-copper alloy with black oxide finish
• Blade Control: Closed-loop PID positioning without mechanical stops
• Bearing: Sapphire jewel
• Duty Cycle: Unlimited
• Shutter Head Lifetime: >10 million cycles
• Insertion Delay Jitter: 10 µs rms typical (at 10 Hz rep rate)
SR475 Specifications
• Clear aperture: ≥0.120 inches (3 mm)
• Repetition rate: Up to 100 Hz
• Rise/fall time: 500 µs typical (full-speed)
SR476 Specifications
• Clear aperture: ≥0.039 inches (1 mm)
• Repetition rate: >125 Hz
• Rise/fall time: 750 µs typical (full-speed)
– Key Features
• Control Modes: Manual (front-panel buttons), external TTL (rear-panel inputs), remote (GPIB/RS-232/Ethernet)
• Polarity Configuration: Individually selectable normal open or normal closed via DIP switches
• Per-Channel Enable: Front-panel enable buttons for each shutter
• Alignment Mode: 1 Hz dither mode on each channel for laser setup
• Global Commands: Front-panel Reset and Set buttons control all manually configured channels
• Fault Detection: Audible and TTL electronic alarms report shutter faults
• Non-Volatile Memory: Preserves operational state and configuration after power-off
• Vibration: Ultra-low vibration design
– Electrical Specifications
• Input Power: 90–260 VAC, 47–63 Hz
• Power Consumption: 75 W (SR474 driver)
• Power Cord: Detachable three-wire with protective ground
– Compatibility & Integration
The SR474 integrates with SR475 and SR476 shutter heads via industry-standard connectors and supports multi-platform control through GPIB, RS-232, and Ethernet remote interfaces.
