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LST4WBK2 Laser Shutter Specifications
Aperture Diameter 4.0 mm
Typical Beam Diameter used for Specs 2.0 mm
Maximum Shutter Repetition Rate 10 Hz
CW and Quasi-CW Optical Power Handling 25 W Au Mirror – 50 W Dielectric
Typical Damage Threshold, Aligned Polarization 1 J/cm2 Au – 3 J/cm2 Dielectric
(PW = 5 ns)
Delay to Begin Opening after Command Open 3 ms
Opening Time Switching Speed 3 ms
Delay to Begin Closing after Command Close 6 ms
Closing Time Switching Speed 6 ms
LST4WBK2 Laser Shutter Specifications
Minimum FWHM Exposure Capability 30 ms using CX4000B
Thermal Power Dissipation Holding Open 3 W (5 V)
Thermal Power Dissipation, Repetitive Cycling 5 W @ 5 Hz
Nominal Magnetic Winding Impedance 8 Ohms
Cable/Wire Type and Length 18 inches, 6 leads 22 g
Mounting Surface for Thermal Sinking Bottom Threaded Surface
Position Sensors Standard, TTL Logic, Require 5 V
Weight 5 oz.
Size (see mechanical drawing) 3.00 x 1.50 x 0.75 inches
Note: 3-D solid model available upon request (Solidworks or .stp file)
Specifications updated on March 30, 2021


This LST4WBK2 laser shutter model is designed for use as a laser safety interlock and for slow processing applications. The magnetic system allows use from 12 or 24 VDC based 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 3 mm to 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 1.50 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)

Laser Shutter

Electrical Drive

LST4WBK2 Laser Shutter Electrical Drive Data

Classification Safety/Process
Number of Wire Leads, Std. Six, 22 g
Cable or Wires – Length 18 inches
Cable/Wire Termination MTA-100, AMP, P/N 643813-60
Recommended Controller and Voltage Present Capacitor Discharge 12-24 V, 12-24 V PWM, or CX4000B
Shutter Winding Resistance 8 Ohms Nominal
Gravity Considerations Symmetric Open/Close speed with base down
Typical Minimum Hold Open Voltage, Room Temperature 4 V
Typical Hold Open Power Dissipation as Heat 3 W
User Power Supply Notes 24 V, 3 A Rating, Surge Capacitor on output
User Drive Circuit/Cap Discharge 12 V, C = 4700 uF, R = 10 ohm 24 V, C = 2200 uF, R = 30 ohm, Flyback diode 1N4001 BUILT-IN
Nominal Winding Inductance 10 mH
User Drive Circuit/PWM Type Boost Open – 24 V for 10 ms, Hold Open – 5 V, Delay Close 10 ms, Brake Close – 24 V for 1 ms
Color Codes and Function of Wires PIN 1 White, + to winding
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 V. Do not try to draw more than about 5 mA from the Yellow or Orange Outputs, or the voltage will load down.