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LST4WBK2 Laser Shutter Specifications
Aperture Diameter 4.0 mm
Typical Beam Diameter used for Specs 2.0 mm
Maximum Optical Power Handling 25 W Au Mirror, 50 W Dielectric
Dielectric Optics 1064 nm (-1), 532 nm (-2), 355 nm (-3), 266 nm (-4), 532/1064 nm (-12)
Metal Optics CO2 (-C2), Aluminum (-Al), STD (Au)
Damage Threshold 500 mJ/cm2 @ 10 ns,
Custom – 2 J/cm2 @ 10 ns
Open Delay Time 3 ms
Open Rise Time 4 ms
Open Total Time 7 ms
Close Delay Time 4 ms
Close Fall Time 7 ms
Close Total Time 11 ms
LST4WBK2 Laser Shutter Specifications
Minimum FWHM Exposure Capability 25 ms
Maximum Shutter Repetition Rate 20 Hz
Thermal Power Dissipation Holding Open 3 W
Thermal Power Dissipation, Cycling 5 W @ 5 Hz
Winding Resistance 8 Ohms
Winding Inductance 11 mH
Position Sensors Standard, TTL Logic, Require 5 VDC @ 30 mA
Cable/Wire Type and Length 18 inches, 6 leads 22 g
Mounting Surface for Thermal Sinking Bottom Threaded Surface
Weight 5 oz.
Size (see mechanical drawing) 3.00 x 1.48 x 0.75 inches
Note: 3-D solid model available upon request (Solidworks or .stp file). Contact us.
Specifications updated on March 30, 2021


This LST4WBK2 laser shutter model is designed for use as a laser safety interlock and for processing applications. The magnetic system is based on 24 VDC circuits. Position sensors are built-in standard, yielding logic outputs for both open and closed states. Dielectric mirrors are available for common wavelengths, providing optical power handling to 50 W. Very low out-gassing materials are used in the construction.Compatible system controllers are CX4000B or user-built circuits designed around 24 VDC.

Options are available using a suffix code system. Many options cannot be installed after manufacture, so choose carefully. Standard mirror is gold for IR use. The –AL suffix is for aluminum mirror, best for UV and visible. The –D123 mirror is a triple line YAG mirror for 355, 532, 1064 nm. The –C2 suffix is for CO2 use. Unit is not designed for upside down operation (w/r to photo), but can be adjusted for this orientation upon request. Other options upon request.

Special Considerations for this model include careful attention to mounting around high magnetic fields, such as Faraday Rotators. The position sensors are TTL logic, so standard handling precautions for electronic static control should be observed.

Restricted use for this model include specific laser wavelengths matching mirror options listed on serial label, high quality thermal mounting, and adequate hold voltage at user’s maximum temperature.

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.


LST4WBK2 Laser Shutter Custom Options

Aperture Size Range 4 mm
Optics Aluminum, Dielectric, Gold
Wire Length Any length
Wire/Cable Type Wire Gauge Teflon, Vinyl
Connector Any 6 pin connector
Size 3.00 x 1.48 x 0.75 in., note: minimal size change can be designed
Identification Engraving, Labels

Mechanical Drawing

LST4WBK2 Laser Shutter Mechanical Drawing
Note: 3-D solid model available upon request (Solidworks or .stp file). Contact us.


Laser Shutter

Electrical Drive

LST4WBK2 Laser Shutter Electrical Drive Data

Classification Safety/Process
Cable or Wires – Length 18 inches
Cable/Wire Termination, Std. MTA-100, AMP, P/N 643813-60
Recommended Controller and Voltage Present Capacitor Discharge 24 V, 24 V PWM, or CX4000B
Power Supply 24 VDC, 3 Amp Rating
Electrical Drive Circuit Boost Open – 24 V @ 10 ms, Hold Open – 5 V, Delay Close – 8 ms, Brake Close – 24 V for 1 ms
Winding Resistance 8 Ohms Nominal
Winding Inductance 10 mH
Gravity Considerations No Restrictions
Typical Minimum Hold Open Voltage, Room Temperature 4 V
Typical Hold Open Power Dissipation as Heat 3 W
User Power Supply Notes 24 VDC, 3 A Rating, Surge Capacitor on output
User Drive Circuit/Cap Discharge 24 V, C = 2200 uF, R = 30 ohm, Flyback diode 1N4001 BUILT-IN STD
Nominal Winding Inductance 10 mH
Color Codes and Function of Wires PIN 1 White, + to winding (observer polarity)
PIN 2 Black, – to winding
PIN 3 Red, Supply Regulated +5.0 VDC — 30 mA
PIN 4 Yellow, NC Output from Sensor – TTL (reads high when shutter closed)
PIN 5 Orange, NO Output from Sensor — TTL (reads high when shutter open)
PIN 6 Blue, 5V Return and Sensor Ground

Read sensor outputs with reference to the blue ground wire. These outputs are totem-pole buffered TTL, seeking a load of ~10 K ohms. Typical output is 4.5 V. Do not try to draw more than about 5 mA from the Yellow or Orange Outputs, or the voltage will load down.