Optical Power Handling: up to 50 W
Aperture: 4 mm
Switching Speed: 10 ms
Logic Position Sensors
Optics: Metal & Dielectric
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OEM Safety
High Rep Rate DPSS
Thin Working Zones
Small Package
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Optical Specifications

Aperture Diameter 4.0 mm
Typical Beam Diameter 2-3 mm
Max. 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

Performance Specifications

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
Min. FWHM Exposure 25 ms
Max. Shutter Repetition Rate 20 Hz
Lifetime Available

Thermal Specifications

Thermal Power Dissipation Holding Open 3 W
Thermal Power Dissipation, Cycling 5 W @ 5 Hz
Mounting Surface for Thermal Sinking Datum A, Datum B

Custom Options

Optics Aluminum, Dielectric, Gold
Wire Length Any length
Wire/Cable Type Wire Gauge Teflon, Vinyl
Connector Any 6 pin connector
Identification Engraving, Labels

Electrical Drive Data

Power Supply 24 VDC, +1.5 Amp Rating
Electrical Drive Circuit Boost Open – 24 V @ 15 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
Position Sensors Logic TTL, Requires 5 VDC @ 30 mA
Cable/Wire Type, No. and Length 18 inches, 6 leads 22 g
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
User Power Supply Notes 24 VDC, 1 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
User Drive Circuit/PWM Type 24 V for 15 ms, then drop to 5 V hold, use Flyback BUILT-IN
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.

Wire Pin # - Color

1 – White Power Winding (+)
2 – Black Power Winding (-)
3 – Red 5 VDC (+) – 30 mA
4 – Yellow Normally Closed Sensor Output (HI – Closed)
5 – Orange Normally Open Sensor Output (HI – Open)
6 – Blue 5V Return and Sensor Ground


Dimensions 3.0 in. x 0.75 in. x 1.48 in.
Weight ~5 oz.
Classification Safety/Process
Gravity Considerations None
Specifications Date March 05, 2024


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.