The Stanford Research Systems SR475 is a precision laser shutter system engineered for accurate, repeatable control of laser beam exposure in scientific and industrial applications. Built around a closed-loop DSP control architecture, the SR475 delivers deterministic shutter blade positioning with minimal mechanical vibration and noise. The system combines sapphire jewel bearings, BeCu alloy blades with black oxide finish, and PID-controlled blade actuation to achieve zero opening/closing bounce and exceptional timing precision across repetition rates from DC to 100 Hz.
Technical Specifications
• Clear aperture: 3 mm minimum diameter
• Repetition rate: DC to 100 Hz
• Exposure rise/fall time: 500 µs typical (full-speed mode)
• Insertion delay jitter: 10 µs rms typical at 10 Hz repetition rate
• Minimum pulse duration: 4 ms
• Blade position control: Closed-loop PID
• Lifetime: 10⁷ cycles minimum
• Operating temperature: 0 °C to 35 °C
• Thermal protection trip: ~60 °C
• Storage temperature: up to 90 °C maximum
• Shutter head power: 4.5 VDC @ 250 mA or 12 VDC @ 1.25 A
• Mounting: Any orientation
– Key Features
• Ultra-low vibration performance via closed-loop DSP control
• Sapphire jewel bearing construction for reliability
• Configurable normally-open or normally-closed operation via DIP switch
• Nine user-configurable instrument settings stored in non-volatile memory
• Automatic fault detection with audible and TTL-level electronic alarms
• Disableable front-panel LED display
– Interfaces & Control
• GPIB, RS-232, and Ethernet connectivity
• Rear-panel auxiliary TTL-level I/O
• Full remote control of all instrument functions
• Shutter head dimensions: 2.25″ × 1.60″ × 1.00″; 1 lb
– Compatibility & Integration
The SR475 shutter head is compatible with the SR470 Laser Shutter Controller and SR474 Four-Channel Laser Shutter Driver. Not suitable for vacuum or oxygen-enriched atmospheres.
