SR470 and SR474 Shutter Systems

Introducing two new optical shutter systems from SRS — the SR470 Laser Shutter Controller and SR474 Four-Channel Laser Shutter Driver. These shutter systems are designed specifically to minimize vibration on your optical table.

They are built around a unique shutter head, supported by one of two available controller models. The SR470 provides timing signals to a single shutter head, while the multi-channel SR474 drives up to four shutter heads, and is controlled by external timing signals.

The Shutter Head

Unlike conventional solenoid based shutters, the SR475 and SR476 shutter heads contain a closed-loop DSP control system that precisely guides the shutter blade between open and closed positions, never encountering physical stops. Vibration and mechanical noise are kept to a minimum, leaving your optical table disturbance-free.

The shutter blade is mounted between sapphire jewel bearings that minimize friction and result in a head lifetime in excess of 10 M cycles — orders of magnitude more than is typically found in shutter heads.

The 3 mm clear aperture (SR475) is designed for easy alignment and is large enough to be used with common light sources. Typical rise and fall times are under 500 µs, and repetition rates from DC to 100 Hz can be used. Unlike other shutters, the SRS shutter is not duty cycle limited — you can run any duty cycle you choose. The SR476 has a 1 mm clear aperture and supports repetition rates to 125 Hz.

SR470 Controller

SR475 head with cover removed revealing control system electronics

The SR470 Shutter Controller allows you to generate timing signals for the shutter head. You have complete control of the exposure time, which can be set between 4 ms and 10,000 s with 0.1 ms resolution. Pre- and post-exposure delays can also be configured. A bright green 8-digit LED display shows the current parameter in seconds or hertz, and timing is accurate to 100 ppm.

A variety of trigger modes are provided — internal, external, front panel, and continuous — giving you the flexibility to handle just about any application. Triggered bursts from milliseconds to months can also be generated, placing the SR470 in a class of its own.

In addition to triggered sequences, the SR470 can also act as a driver to actuate the shutter head from your own timing signals. You can also manually control the shutter from the front panel.

Remote operation is supported with GPIB, RS-232 and Ethernet computer interfaces. All instrument functions can be controlled and read over any of the interfaces. Up to nine complete instrument configurations can be saved in non-volatile RAM and recalled at any time. Shutter faults are automatically detected and reported with audible and electronic (TTL) alarms.

SR475 Shutter Head on mount

SR474 Four-Channel Driver

The SR474 Four-Channel Driver interfaces with up to four shutter heads. Rear-panel TTL level inputs are provided for your external timing signals. Each of the four channels can be set for normally open or normally closed operation.

Each channel has a front-panel State button which allows you to manually change the shutter state. The channel Source buttons set each channel to manual, external TTL or remote state control. Each channel also has an Align button that drives its shutter head at a 1 Hz rate making laser alignment simple. The Global Control section of the front-panel allow you to set or reset all channels to their “normal” states.

As with the SR470, remote operation is supported with GPIB, RS-232 and Ethernet computer interfaces. All instrument functions can be controlled and read over any of the interfaces. Shutter faults are automatically detected and result in audible, visible and electronic alarms.

About the Shutter Head

SR475 Dimensional Drawing (in inches)

Unlike conventional designs, the SR475/476 Shutter Head can be mounted on your optical table in any orientation. This gives you complete flexibility to route the mating cable out of the way of your experiment.

The 3 mm aperture is positioned very close to the chassis edge, making the SR475 and SR476 ideal for chopping one of two parallel beams separated by less than a centimeter. It also allows you to operate your lasers very close to the plane of your optical table top.

The small size of the shutter heads make them ideal in tight quarters, and with a precision guided blade, shutter vibration is essentially eliminated.

 

 

Phone: (408)744-9040 • Fax: (408)744-9049 • email: info@thinkSRS.com • www.thinkSRS.com

SR475 & SR476 Laser Shutter Heads
Mechanical
Shutter blade	BeCu alloy, black oxide finish
Clear aperture	0.120 in. min. diameter (SR475) 0.039 in. min. diameter (SR476)
Repetition rate	100 Hz (SR475) >125 Hz (SR476)
Exposure rise/fall time	500 µs typ., in full-speed mode (SR475) 750 µs typ., in full-speed mode (SR476)
Insertion delay jitter	10 µs rms typ. (measured at 10 Hz rep rate)
Bearing	Sapphire jewel bearing
Blade position	Closed-loop PID controlled. Can be operated as NO or NC.
Opening/closing bounce	None allowed
Operating temperature	0 °C to 35 °C
Mounting	Any orientation
General
Max. cable length	3 m
Weight	1 lbs.
Dimensions	2.25" × 1.60 " × 1.00" (WHL)
Power	4.5 VDC @ 250 mA, 12 VDC @ 1.25 A
Warranty	One year parts and labor on defects in materials and workmanship, or 10 M cycles, whichever comes first.
SR470 Controller
Timing
Resolution	100 µs (8-digit display)
Accuracy	100 ppm
Pre-exposure delay	0 to 10,000 s
Exposure time	4 ms to 10,000 s
Post-exposure delay	4 ms to 10,000 s
Repetition rate	Shutter limited
Initial state	Normally open or closed (user defined)
Shutter type	SR470 Series Laser Shutter
Triggering
Modes	Internal, external TTL, external level, front panel, continuous
Triggered burst	1 to 99,999,999 timing cycles
System Fault and Alarms
Alarm types	Fault LED indicator, audible alarm, and rear-panel TTL output. System automatically detects shutter fault.
Display
Type	7-segment LED, 8-digit
Display blanking	Front panel LEDs can be disabled.
General
Interfaces	GPIB, RS-232 and Ethernet. All instrument functions are controllable over the interfaces.
Shutter alignment	Align button chops shutter at 1 Hz
Save/recall	Nine sets of instrument settings can be saved and recalled.
Auxiliary I/O ports	Rear-panel Aux I/O 1 & Aux I/O 2. TTL level, multipurpose ports.
Control input	Context sensitive TTL input. Triggers on falling edge. TTL-high resets to Normal state. TTL-low sets to Normal- state.
Sync out	Rear-panel TTL level output.
Power	40 W, 90 to 264 VAC, 47 to 63 Hz
Dimensions	7.95" × 3.37" × 10.25" (WHL)
Weight	7 lbs.
Warranty	One year parts and labor on defects in materials and workmanship
SR474 Four-Channel Driver
Operation
Shutter type	SR470 Series Laser Shutters
Shutter state	Shutter state can be controlled manually from front panel or from external TTL timing signals.
Channel enable	Front panel Enable buttons enable or disable each channel.
Global control	Sets or resets all channels to their "Normal" states.
Shutter alignment	Front-panel Align buttons cause selected channels to change state at a 1 Hz rate for easy laser alignment.
Triggering
Modes	Front-panel Source button selects external TTL, manual or remote (computer interface) state control.
Repetition rate	Shutter limited
System Fault and Alarms
Alarm types	Fault LED indicators, audible alarm,and rear-panel TTL output. System automatically detects shutter fault.
General
Display blanking	Front -panel LEDs can be disabled.
Interfaces	GPIB, RS-232, and Ethernet. All instrument functions are controllable over the interfaces.
Auxiliary I/O port	Rear-panel Aux I/O, TTL level
Shutter polarity	"Normally Open" and "Normally Closed" states for each channel are set on rear-panel DIP switch.
Shutter connector type	IEEE-1254
Power	75 W, 90 to 264 VAC, 47 to 63 Hz
Dimensions	7.95"× 3.37 " × 10.25 " (WHL)
Weight	7 lbs.
Warranty	One year parts and labor on defects in materials and workmanship. (SR475 and SR476 shutter heads are warranted for 90 days)
Phone: (408)744-9040 • Fax: (408)744-9049 • email: info@thinkSRS.com • www.thinkSRS.com