LST4WBK2 Laser Shutter

Optical Specifications

Aperture Diameter	4 mm
Typical Beam Diameter	2 – 3 mm
Maximum Optical Power Handling	50 W (Dielectric Optics) 25 W (Gold/Al Optics)
Optics Options	Gold, Aluminum, or Dielectric
Dielectric Optics Suffix	1064 nm (-1), 532 nm (-2), 355 nm (-3), 266 nm (-4), 532/1064 nm (-12), 355/532/1064 nm (-123)
Metal Optics Suffix	CO2 (-C2), Aluminum (-AL), STD (Au)
Laser Induced 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 Options	Gold, Aluminum, or Dielectric
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
Recommended Controller (and Voltage Present)	CX4000B (or Capacitor Discharge 24 V, 24 V PWM)
Winding Resistance	8 ohms Nominal
Winding Inductance	10 mH
Position Sensors	Logic TTL, Requires 5 VDC @ 30 mA
Cable/Wire Type, No., Length Termination	22 g, six wires, 18 in., MTA-100, AMP, P/N 643813-60
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
User Power Supply Notes	24 VDC, 1 A Rating, Surge Capacitor on output, 3 A Rating

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

Attributes

Dimensions	3.0 in. x 0.75 in. x 1.48 in.
Weight	~5 oz.
Classification	Safety/Process
Specifications Date	March 5, 2024

Description

The 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 up 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 (see LST4WBK2-AL). The -3 mirror can be used for UV applications with 355 nm laser beams (see LST4WBK2-3). The –123 mirror is a triple line YAG mirror for 355, 532, 1064 nm (see LST4WBK2-D123). Unit is not designed for upside down operation (w/r to photo), but can be adjusted for this orientation upon request. Other options are available 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.