|Laser Shutter Systems||SR470 & SR474 ... from $1395|
|SR470 & SR474 — Laser shutters & controllers|
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|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.|
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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.
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.
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
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.
|SR475 & SR476 Laser Shutter Heads|
|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)
|Minimum exposure time||5 ms(SR475)
|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|
|Max. cable length||3 m|
|Dimensions||2.25" × 1.60 " × 1.00" (WHL)|
|Power||4.5 VDC @ 250 mA, 12 VDC @ 1.25 A|
|Resolution||100 µs (8-digit display)|
|Pre-exposure delay||0 to 10,000 s|
|Exposure time||4 ms to 10,000 s (shutter limited)|
|Post-exposure delay||4 ms to 10,000 s (shutter limited)|
|Repetition rate||Shutter limited|
|Initial state||Normally open or closed (user defined)|
|Shutter type||SR470 Series Laser Shutter|
|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.|
|Type||7-segment LED, 8-digit|
|Display blanking||Front panel LEDs can be disabled.|
|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)|
|Warranty||One year parts and labor on defects in materials and workmanship|
|SR474 Four-Channel Driver|
|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.|
|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.|
|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)|
|Warranty||One year parts and labor on defects in materials and workmanship. (SR475 and SR476 shutter heads are warranted for 90 days)|