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LSTXYW8 Laser Shutter Specifications
Aperture Diameter 14.0 mm
Typical Beam Diameter used for Specs 10.0 mm
Maximum Shutter Repetition Rate 3 Hz
CW and Quasi-CW Optical Power Handling 300 W with Chiller Plate
Typical Damage Threshold, Aligned Polarization 5-15 J/cm2
Open Delay Time 10 ms
Open Rise Time 40 ms
Close Delay Time 10 ms
Close Fall Time 40 msec using CX4000B,
100 msec w/o dampening
LSTXYW8 Laser Shutter Specifications
Minimum FWHM Exposure Capability 60 msec using CX4000B
Thermal Power Dissipation Holding Open 6 W
Thermal Power Dissipation, Repetitive Cycling 15 W @ 3 Hz
Nominal Magnetic Winding Impedance 8 Ohms
Cable/Wire Type and Length 6 Ft Cable, PVC Jacket Cable
Mounting Surface for Thermal Sinking Base Plate or Bottom Output Aperture
Position Sensors Independent Open/Close Micro-Switches Std.
Weight 2.5 lbs. with cable
Size (see mechanical drawing) 1.00 x 4.00 x 6.00 Inches + Base Plate
Note: 3-D solid model available upon request (Solidworks or .stp file)


This LSTXYW8 model is designed for use primarily as a safety interlock shutter for YAG and similar solid-state lasers with high Q-Switched energy per pulse. It uses dielectric optics from world-leading coating suppliers, providing damage thresholds of 5 J/cm2 at 355 nm to 15 J/cm2 at 1064 nm for low ns laser pulses. The redirected energy is diffused thru UV grade fused silica, then absorbed inside the shutter. The 40 msec switching speed allows it to extract single pulses from lasers pulse trains up to 10 Hz. Closing settling time depends on orientation w/r to gravity. For fastest closure, use the CX4000B controller PCB.

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 1.000” round dielectric optics on 1 mm substrates are used from major industry suppliers. Mirrors are bonded into moving assembly. Use suffix –1 for 1064 nm, -2 for 532 nm, -3 for 355 nm, -4 for 266 nm, and –12 for 532+1064 harmonic mirror (lower damage threshold). Use –C2 for CO2 use. Additional mirrors are available for specific laser lines. Contact our application engineers. Referring to the plane of the Base Plate, CX4000B controller can be calibrated for horizontal or vertical calibration. Horizontal is the default (as shown in product photo). Circuits not using dampening on closure will generate longer settling times for closure spec, up to 100 msec maximum.

Special Considerations for this model include precautions to use proper laser with installed mirror, and add chiller plate accessory for loads over 50 watts. Beam tube abutment to input/output is typical; back-scatter is a little higher on this model than on others due to compact thickness.

Restricted use for this model include mirror choice compatible with laser, and observance of gravity mounting orientation for critical timing applications.

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.


LSTXYW8 Laser Shutter Custom Options

Aperture Size Range 14mm to 15mm
Optics Aluminum, Coated Aluminum, Dielectric, and Gold
Wire Length Any Length
Wire/Cable Type Wire Gauge 6-C CABLE
Connector Any 6-Pin Connector
Size 4 x 6 x 1 in., note: minimal size change can be designed
Identification Engraving, Labels

Mechanical Drawing

LSTXYW8 Laser Shutter Mechanical Drawing

Note: 3-D solid model available upon request (Solidworks or .stp file)

Electrical Drive

LSTXYW8 Laser Shutter Electrical Drive

Classification Safety/Process
Number of Wire Leads, Std. Six, 22 g
Cable or Wires – Length Cable, 6 feet, PVC Jacket
Cable/Wire Termination Flying Leads
Recommended Controller and Voltage Present Capacitor Discharge 24 V, 24 V PWM — or our CX4000B Controller
Shutter Winding Resistance 8 Ohms Nominal
Gravity Considerations Heavy Optics. Mounting Orientation will affect amount of power used to open.
Not designed for upside-down mounting.
Typical Hold Open Power Dissipation as Heat 6 W
User Power Supply Notes 24-28 V, 3 A Rating, Surge Capacitor on Output
User Drive Circuit/Cap Discharge 24-28 V, C=15000 mmF, R=50 ohm, Use Flyback Diode 1N4001
Nominal Winding Inductance 25 mH
User Drive Circuit/PWM Type 24-28 V for 70 ms, then drop to 7 V hold, Use N4001 Flyback


If an LSTXYW8 (supplied with cable/flying leads) and controller CX2450B (obsolete) were purchased separately, attach wires of shutter to the cable as shown below. The CX2450B must be labeled for mechanical switch option and LSTXYW8 shutter type.

Classification Safety/Process Safety/Process
White White + Power to Winding
Black Black – Power to Winding
Red Red Sensor Switch
Blue Blue Sensor Switch
Green Green Sensor Switch
Orange Brown/Or Sensor Switch

Standard Shutter Format, Mechanical Microswitches for Position Sensors:

Shutter Wire Color Function
White +Power to Winding
Black -Power to Winding
Red/Orange Pair Open Switch, Reads Continuity when Shutter Open
Blue/Green Pair Closed Switch, Reads Continuity when Shutter Closed

Switches rated for 1 A at 24 VDC.