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Plate Beamsplitters

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About Plate Beamsplitters

Plate beamsplitters are used to break incident, monochromatic light beams into two beams, each with a specified intensity ratio.  Plate beamsplitters are optical windows with a semi-transparent mirrored coating, which passively breaks the beam into two or more separate beams.  One of the beams is reflected incident energy, of which a very small portion is absorbed, while the second beam is fully transmitted. In addition to the task of dividing light, beamsplitters can be employed to recombine two separate light beams or images into a single path.

Plate beamsplitters are often referred to as mirror beamsplitters as the neutral color characteristics provided by their optical crown glass designs gives the appearance of a mirror. Having a partially silvered coating allows them to produce a desired transmission-to-reflection ratio. These ratios usually vary between 50:50 and 20:80, depending upon the application, when operated at 45 degrees of incidence.  In most cases, plate beamsplitters have multiple layers of dielectric coating on one surface, while the second surface is coated with an antireflective material, which helps to, but doesn’t completely remove ghosted images.  The second surface may also be wedged to eliminate internal fringe, which can help to cut down the incidence of ghosting even further.  However, if the removal of ghosted beams is of primary concern, pellicle or cube beamsplitters should be used instead plate beamsplitters. 

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Engineering Web: Plate Beamsplitters

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Beamsplitters - Edmund Optics
From cube and laserline to polarizing and plate, Edmund Optics has a large inventory of beamsplitters ready-to-ship.
See Edmund Optics Inc. Profile & Catalog
Plate Beamsplitters - Edmund Optics
products : optics : beamsplitters : plate beamsplitters Plate Beamsplitters A mirror-type (plate) beamsplitter
See Edmund Optics Inc. Profile & Catalog
Thorlabs.com - 50:50 Broadband Plate Beamsplitters
Beam Samplers Plate Beamsplitters Economy Beamplitters Pellicle Beamsplitters
See ThorLabs, Inc. Information
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