Optical Shutter

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

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

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