Plate Beamsplitters Information

Plate Beamsplitters Information

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.

Shapes Available

Plate beamsplitters are available in three distinct shapes; circular, square and rectangular.  Circular and square plate beamsplitters are generally designed to function at 45 degree incidence, while rectangular plates usually function at 0 degrees of incidence.  However, beamsplitters of all three shapes are available that can function at either or both angles of incidence.

• Beamsplitters: A Guide for Designers
  Plate beamsplitters consist of a thin plate of optical crown glass with a different type of coating deposited on each side. The first surface is coated with an all-dielectric film having partial reflection properties over either the visible or the near-infrared spectrum. The benefit of this type...
• Standard Coatings Performance Graphs
  ) Dielectric Multi-Layer. High Reflectivity Nd: YAG Laser. Mirror Coating at 45". Angle of Incidence (Suffix: 505). 1064nm/Dielectric Multi-Layer. High-Reflective Dielectric. (Suffix: 506) 550-650nm 0º. Angle of Incidence. 50/50, Flat Response,. Neutral Density Beamsplitter. (Filter)/Plate Type (Suffix...
• Long Scan Autocorrelator
  . This is the correct orientation for the mirrors if the laser. using the parts from the Iris Assembly. The Iris Assembly. beam is horizontally polarized. (If the laser is polarized in. should be aligned such that the beam is centered in the. the vertical direction, a /2 wave-plate should be used...