Online RFQ
Optical Shutter
Laser Safety Shutter
High Rep Rate DPSS
Small Package

consult with us


LST218 Optical Shutter Specifications

Aperture Diameter 3.0 mm
Typical Beam Diameter used for Specs 2 mm
Maximum Shutter Repetition Rate 50 Hz
CW and Quasi-CW Optical Power Handling 1 W
Typical Damage Threshold, Aligned Polarization 30 mJ/cm2 (PW = 10 ns)
Delay to Begin Opening after Command Open 0 ms
Opening Time / Switching Speed 10 ms
Delay to Begin Closing after Command Close 0 ms
Closing Time / Switching Speed 10 ms
Minimum FWHM Exposure Capability 10 ms
Thermal Power Dissipation Holding Open 2.4 W MAX
Thermal Power Dissipation, Repetitive Cycling 1.2 W @ 50 Hz
Nominal Magnetic Winding Impedance 63 Ohms
Cable/Wire Type and Length 18-inch twisted pair, 22 AWG
Mounting Surface for Thermal Sinking Output APT Face, Bottom Face
Position Sensors Not Available
Weight 5 oz.
Size (see mechanical drawing) 2.10 x 1.35 x 0.38 inches


The high reliability LST218 optical shutter model is designed for use as a process shutter or moderate reaction safety interlock systems. Its solid copper package efficiently manages thermal flow, delivering the heat to the mounting surfaces. The LST218 has the same exterior dimensions as our popular LST200SLP model, with a larger (3 mm) aperture. The LST218 is designed to run on 12 VDC (direct drive), making the user drive circuit straightforward. This model will dissipate a maximum of 2.4 W thermal power when holding open.

Considerations for all shutters include proximity to high magnetic fields and strict observance of optical power rating. Subjecting shutter to “large” size dust particles and debris could inhibit shutter motion.

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. See the Product Matrix page to compare laser shutter models.


LST218 Optical Shutter Custom Options

Aperture Size Not Available
Wire Length 2 Ft max
Wire/Cable Type Wire Gauge Teflon, Vinyl
Connector Any 2-pin
Identification SN engraving, SN / PN Labels

Mechanical Drawing

LST218 Optical Shutter Mechanical Drawing
Note: STEP file available upon request.

Electrical Drive

LST218 Optical Shutter Electrical Drive

Classification Safety/Process
Number of Wire Leads, Standard. Two, 22 AWG
Cable or Wires – Length 18 inches
Cable/Wire Termination Flying
Recommended Controller and Voltage Present 12 VDC Direct drive
Shutter Winding Resistance 63 Ohms Nominal
Gravity Considerations None
Minimum Hold Open Voltage, Room Temperature 12 VDC Direct drive
Typical Hold Open Power Dissipation as Heat 2.4 W
User Power Supply Notes 12 V, 200 mA Rated
User Drive Circuit/Cap Discharge 12 V to open / hold open
Nominal Winding Inductance
User Drive Circuit/PWM Type Direct drive