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6" (155 mm) Ruler with
200 mm (7.87")
11.81" (300 mm)
BHMA1 Bracket Attaching Two Beam Height Rulers for Vertical and Horizontal Alignments
Mounting Bracket for Beam Height Rulers
Made from anodized aluminum, these alignment screens have been laser engraved with either a target grid or ruler graduations to assist in the alignment and height measurement of a beam. Additionally, the BHM1 and BHM2 rulers have Ø2.0 mm (Ø0.08") holes to allow a beam to pass through. These holes are present on each ruler at imperial (1.00") as well as metric (25.0 mm) intervals. Each alignment screen features magnets in its base for quick placement and removal. For more permanent mounting to magnetic or nonmagnetic surfaces, the TPSM1(/M) and TPSM2(/M) also have a mounting slot for a 1/4"-20 or M6 cap screw.
Mounting Brackets are also available that allow two beam height rulers (Item # BHM1 and BHM2) to be attached at a 90° angle. This allows for alignment of a laser beam horizontally in addition to measuring its height off the table.
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TPSM1 in a Beam Stabilization Setup
Our Magnetic Laser Safety Screens are laser engraved on one side with a 1/2" (10 mm for metric versions) target grid for rough laser alignment, while the other side is blank to provide a complete beam blocking option. The base of the screen is fitted with a pair of magnets that hold the screen to magnetic work surfaces and provide flexibility of movement. A through hole is also provided to allow the screen to be tightened down using a cap screw for more permanent placement or for use in non-magnetic applications. The compact size of the screen allows it to fit into small gaps between your accessories, enabling easy integration into a laser setup. This screen is constructed from bead-blasted aluminum to remove any sharp edges, which is then anodized to create a homogeneously diffusive surface.
Please note: Due to the presence of strong magnets, these laser screens should not be used in the vicinity of pacemakers, credit cards, or other devices affected by magnetic fields.
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Light from a HeNe Laser Passing Through a Hole in a BHM1 Ruler
Our BHM1 and BHM2 Magnetic Rulers measure beam heights up to 6" (155 mm) or 12" (305 mm), respectively. The front of the screen is laser engraved with 1.0 mm and 1/16" graduations for beam height measurement. Twelve Ø2.0 mm (Ø0.08") holes positioned next to the engraved numbers at 25.0 mm and 1.00" intervals allow the laser beam to pass through the ruler.
The base of each ruler is fitted with a pair of neodymium magnets that hold the ruler to magnetic work surfaces and provide flexibility of movement when compared to an option that is bolted to the table. They are constructed from bead-blasted aluminum to remove any sharp edges and then anodized to create a homogeneously diffusive surface. The compact size allows the tool to fit into small gaps between components, enabling easy integration into a setup.
We also offer the BHMA1 bracket below for attaching two beam height rulers, allowing for the alignment of a laser beam horizontally in addition to measuring its height off the table.
Please note: Due to the presence of magnets, this ruler should not be used in the vicinity of pacemakers, credit cards, or other devices affected by magnetic fields.
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BHM1 Mounted at 90° on a BHM2 Using the BHMA1 Bracket
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VRC4 on a BHM1
Thorlabs' BHMA1 Mounting Bracket allows two beam height rulers, sold above, to be attached at a 90° angle. This capability allows for alignment of a laser beam horizontally in addition to measuring its height off the table. As shown in the image to the right, the bracket can also be used to attach Laser Viewing Cards to a ruler, allowing for the viewing of UV, NIR, or MIR beams.
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BHMA1 Mechanical Drawing
Constructed from durable black Delrin®, this bracket contains a built-in spirit level (bubble level) for consistent leveling of the mounted part. When the bubble is centered between the two graduations the bracket is level. When the center of the bubble is under one of the graduations then the bracket is rotated by 31 arcminutes.
Laser engraved 1.0 mm spaced graduations are also included on three sides of the bracket. These markings can be used to indicate how far the mounted part has been translated horizontally or to repeatably add a ruler or viewing card into the setup.
Two through slots, shown in the drawing to the left, in the bracket are spaced to fit over the top of a BHM1 or BHM2 ruler. Once fitted the bracket is free to translate vertically across the ruler. From here a second ruler or a viewing card is placed in the space between the first ruler and the front of the bracket. Everything is held in place by applying pressure using the thumbscrew on the front of the bracket.
Please Note: These brackets are created from Delrin® and are not rated for laser safety.
†Delrin® is a registered trademark of Dupont Polymers, Inc.