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Alignment Screens![]()
TPSM1/M 200 mm (7.87") TPSM2 11.81" (300 mm) BHMA1 Mounting Bracket for Beam Height Rulers BHM3 6" (155 mm) Magnetic Beam Height Measuring Tool ![]() Please Wait Made from anodized aluminum, the TPSM1(/M) and TPSM2(/M) Alignment Screens have been laser engraved with a target grid to assist in the alignment and height measurement of a beam. Each alignment screen features magnets in its base for quick placement and removal. For more permanent mounting to magnetic or nonmagnetic surfaces, each screen also has a mounting slot for a 1/4"-20 or M6 cap screw. The BHM3 and BHM4 Magnetic Beam Height Rulers feature holes at 25 mm and 1" intervals to allow a laser beam to pass through. The rulers are laser engraved with both imperial and metric scales and are held onto any magnetic surface by either one or two neodymium magnets. The BHM3 has one of these magnets, while the BHM4 has a pair. Two beam height rulers can be attached at a 90° angle using the BHMA1 Mounting Bracket, allowing for horizontal alignment of a laser beam in addition to measuring its height off the table.
![]() ![]() Click to Enlarge 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. ![]() ![]() Click to Enlarge Each ruler has holes next to the major ticks of the metric and imperial scales to allow a laser beam to pass through. ![]() Click to Enlarge Light from a HeNe Laser Passing Through a Hole in a BHM3 Ruler
Our BHM3 and BHM4 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. A series of twelve or twenty four Ø2.0 mm (Ø0.08") holes (on the BHM3 and BHM4 respectively) are positioned next to the engraved numbers at 25.0 mm and 1.00" intervals to allow a laser beam to pass through the ruler. The base of each ruler is fitted with either one or two 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. The BHM3 has one of these magnets, while the BHM4 has a pair. Both rulers 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.
![]() ![]() Click to Enlarge BHM3 Ruler Mounted at 90° on a BHM4 Ruler Using the BHMA1 Bracket ![]() Click to Enlarge VRC4 IR Detector Card on a BHM3 Ruler
Thorlabs' BHMA1 Mounting Bracket allows two beam height rulers 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. ![]() Click for Details 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. A through slot in the top of the bracket, shown in the drawing to the left, is shaped to fit over the top of the BHM3 and BHM4 rulers. 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. | |||||||||||||||||||||||||
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