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Optical Shutter
Biotech Exposures
500 Million Cycles
OEM Requiring Speed

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LST200-F40 Optical Shutter Specifications
Aperture Diameter 4.0 mm
Typical Beam Diameter used for Specs 2 mm
Maximum Shutter Repetition Rate 25 Hz
CW and Quasi-CW Optical Power Handling 6.0 Watts
Typical Damage Threshold, Aligned Polarization 300 mJ/cm2 (PW=10 ns)
Delay to Begin Opening after Command Open 4 ms
Opening Time / Switching Speed 8 ms
Delay to Begin Closing after Command Close 4 ms
Closing Time / Switching Speed 8 ms
LST200-F40 Optical Shutter Specifications
Minimum FWHM Exposure Capability 20 ms
Thermal Power Dissipation Holding Open 4.5 W MAX
Thermal Power Dissipation, Repetitive Cycling 6.0 W @ 25 Hz
Nominal Magnetic Winding Impedance 22 Ohms
Cable/Wire Type and Length 18-inch harness, 26 AWG
Mounting Surface for Thermal Sinking Input Apt Face, Bottom Face
Position Sensors Phototransistor, 5V TTL logic
Weight 6 oz.
Size (see mechanical drawing) 2.10 x 1.35 x 0.39 inches
Note: 3-D solid model available upon request (Solidworks or .stp file). Contact us.


The LST200-F40 model is our smallest optical shutter featuring two positions sensors and a 4 mm aperture. This model is designed for use as a fast process shutter and quick reaction safety interlock. The inherent speed is achieved with efficient electrical power requirement. The F40 can be used in applications that operate continuously and has been proven to perform without failure beyond a half a billion cycles. The flexing motion is achieved using our patented technology for highest reliability. The solid copper package efficiently manages thermal flow, rapidly transferring the heat load to the mounting surfaces.

Our optical shutters and laser shutters are optimized for use with our CX4000B shutter driver or user-built circuits designed around 24 VDC. The user-built circuit can be a typical current driver based around 24V or 24V / PWM drive circuit, although choice of controller / user circuit can affect the shutter’s switching speeds and bounce control.

See the Mechanical Drawing tab for dimensions. Also see the Application Notes in the Technical Information menu for important operational issues including thermal mounting, user-built circuits, polarization, lifetime, jitter, vacuum operation, and contamination.

The F40’s Input Aperture face is the ideal thermal mounting surface for high heat loads. Alternatively, the bottom surface can be used for low-moderate heat loads. Restrictions for this model include proximity to high magnetic fields and strict observance of optical power rating. Large size particle contamination could inhibit blade motion causing failure to open or close.


LST200-F40 Optical Shutter Custom Options

Aperture Size Range Not available
Wire Length 2 feet maximum
Connector Any 9-pin connector
Identification SN engraving, SN / PN Labels

Mechanical Drawing

LST200-F40 Optical Shutter Mechanical Drawing

Note: 3-D solid model available upon request (Solidworks or .stp file). Contact us.


Electrical Drive

LST200-F40 Optical Shutter Electrical Drive

Classification Optical / Process Shutter
Number of Wire Leads, Standard 9 Wires, 26 AWG
Cable or Wires – Length 18 inches, 2 feet MAX
Cable/Wire Termination 9-pin Molex 0050579409
Recommended Controller and Voltage Present CX4000B or 24V / PWM
Shutter Winding Resistance 22 Ohms Nominal
Gravity Considerations None
Typical Minimum Hold Open Voltage, Room Temperature 9.5 V
Typical Hold Open Power Dissipation as Heat 4.5 W
User Power Supply Notes 24 V, minimum 1 A rating
Nominal Winding Inductance 10 mH
User Drive Circuit/PWM Type Energize (open): Apply 24 V for 3.6 ms, 9.5 – 10 V hold for long-term hold

Release (close): Use 3.4 ms delay, 0.4 ms brake pulse for optimum bounce control on closure

Color Codes and Function of Wires

1 – RED + Power to Winding
2 – BLACK – Power to Winding
3 – GREEN Case Ground
4 – VIOLET LED Anode (Open Sensor)
5 – BROWN LED Anode (Close Sensor)
6 – YELLOW LED Common Ground
7 – WHITE Collector (Open Sensor)
8 – ORANGE Collector (Close Sensor)
9 – GRAY Emitter Common Ground