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Polka Dot Beamsplitters![]()
BPD254S-G (1" x 1", B270 Glass Substrate) BPD5254-G01 (Ø1", CaF2 Substrate) BPD7254-M01 (Ø1", ZnSe Substrate) BPD508-FS (Ø2", UVFS Substrate) ![]() Please Wait ![]() Detail of Aluminum Coating Pattern ![]() Features
Thorlabs' 50:50 Polka Dot Beamsplitters offer a nearly constant beamsplitting ratio over their entire specified spectral range. They consist of a vacuum-deposited metal coating on one of four substrates: UV Fused Silica, B270, CaF2, or ZnSe. Due to their metal coatings, they can be used through a wide range of incident angles with only negligible changes to the reflected and transmitted intensity. To view wavelength- and angle-dependent reflection and transmission data, please click on the graph icons in the tables below. The metal coating is applied in a regularly repeating array, which lends the beamsplitter its "polka dot" appearance, as shown to the right. Light is reflected by the metal-coated portion of the beamsplitter and transmitted through the uncoated portion of the beamsplitter. To maximize the reflected intensity, light should be incident on the coated side of the beamsplitter. The square dots have 0.0040" (100 µm) [UVFS, B270, and CaF2] or 0.0042" (107 µm) [ZnSe] sides. The spacing between the dots is 0.0022" (56 µm) [UVFS, B270, and CaF2] or 0.0018" (46 µm) [ZnSe] in all directions. Polka dot beamsplitters are typically used at a 45° angle relative to the incident beam as shown in the diagram above. Our polka dot beamsplitters transmit 50% ± 5% (±10% for ZnSe) when a beam is larger than 2 mm in diameter. The Ø1" and Ø2" polka dot beamsplitters can be mounted into any of our Ø1" and Ø2" optic mounts, respectively. The 1" square beamsplitters can be held in a fixed filter mount like our DH1 Compact Dual Filter Holder. Thorlabs also offers a family of plate beamsplitters with dielectric coatings. For more information on selecting a beamsplitter, please see the BS Selection Guide tab. Thorlabs' portfolio contains many different kinds of beamsplitters, which can split beams by intensity or by polarization. We offer plate and cube beamsplitters, though other form factors exist, including pellicle and birefringent crystal. Many of our beamsplitters come in premounted or unmounted variants. Below is a complete listing of our beamsplitter offerings. To explore the available types, wavelength ranges, splitting/extinction ratios, transmission, and available sizes for each beamsplitter category, click More [+] in the appropriate row below. Non-Polarizing Beamsplitters
Polarizing Beamsplitters
Other Beamsplitters
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These Polka Dot Beamsplitters are made from UV Fused Silica (UVFS) and provide high transmission over the 250 nm - 2.0 µm spectral range. They can be used from 0 to 45° AOI with only negligible changes to the reflected and transmitted intensity. Light should be incident on the aluminum-coated side to maximize the reflected intensity. ![]()
These Polka Dot Beamsplitters are made from B270 glass and provide high transmission over the 350 nm - 2.0 µm spectral range. They can be used from 0 to 45° AOI with only negligible changes to the reflected and transmitted intensity. Light should be incident on the aluminum-coated side to maximize the reflected intensity. ![]()
These Polka Dot Beamsplitters are made from Calcium Fluoride (CaF2) and provide high transmission over the 180 nm - 8.0 µm spectral range. They can be used from 0 to 45° AOI with only negligible changes to the reflected and transmitted intensity. Light should be incident on the aluminum-coated side to maximize the reflected intensity. ![]()
This Polka Dot Beamsplitter is made from Zinc Selenide (ZnSe) and provides high transmission over the 2.0 - 11.0 µm spectral range. It can be used from 0 to 45° AOI with only negligible changes to the reflected and transmitted intensity. Light should be incident on the gold-coated side to maximize the reflected intensity. This beamsplitter has a bare gold polka dot pattern on one side and an engraved arrow indicating the direction of transmission on its edge. Please only use compressed air to clean this optic. All other cleaning materials could damage the polka dot pattern. When handling optics, one should always wear gloves. This is especially true when working with zinc selenide, as it is a hazardous material. For your safety, please follow all proper precautions, including wearing gloves when handling these lenses and thoroughly washing your hands afterward. Thorlabs will accept all ZnSe lenses back for proper disposal. Please contact Tech Support to make arrangements for this service. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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