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The high quality optical beam splitters of the DST series split incident light into a transmission and a reflection component. Light, an image or a laser are partially reflected as by a mirror and partially transmitted as through a window. The input side of the 45° plate beam splitters is coated with a dielectric thin film, which determines the splitting ratio of the optics. On the back of the beam splitters there is a broadband multilayer anti-reflection coating that effectively suppresses secondary reflections. This AR-coating almost completely eliminates so-called "ghost images" and phantom laser beams in the visible wavelength range. Losses and image overlays, which would otherwise be caused by reflections from an uncoated back side are therefore virtually eliminated. Unlike dichroic beamsplitters like our SIR Hot Mirror or the SHD cold-mirrors, our DST has a non-dichroic design. Thus, it does not separate different optical spectra from each other or filter out wavelength ranges, but divides incident light rays in the VIS spectrum to a large extent color neutral.
A non-metallic, all dielectric structure of the thin-film layers ensures longevity and good abrasion resistance of the DST. Moreover, the layer system of the semitransparent mirrors only has a very low absorption in the nominal wavelength range. Therefore almost no energy is lost through absorption effects, as is typical for metallic beam splitter optics. This low loss design allows the beam splitters to be used to split laser beams up to medium laser power. As substrate material for the DST splitter optics we use iron-reduced glass with excellent optical characteristics.
The polarization directions of photons in an unpolarized light beam are uniformly distributed which is not the case in a polarized light beam. All DST beam dividers are designed for unpolarized light. Therefore, when used with a polarized light or laser, the splitting ratios may deviate from the set values given in this data sheet for unpolarized light sources. The DST beam splitters are generally not specified with regard to polarization behavior or polarization effects. However, this does not exclude applications with polarized light. Often the desired splitting ratio can be easily achieved by selecting an existing higher or lower nominal splitting ratio for randomly polarized light. In such cases, the cost can be drastically reduced compared to a custom coating batch. However, if you search for specialty beam splitter optics for polarized light sources or a polarized laser, please let us know the desired specifications. In the case of special requirements for the polarization properties in most instances we are capable of fabricating customer-specific polarization-optimized beam splitter optics on a batch basis.
In addition to our standard beam splitters, the DST300, DST500, and DST700 series, the splitting ratios can be adapted to custom specifications. From a certain quantity upwards we can also produce cube beamsplitters, beamsplitter penta-prisms, NIR dividers, and high-performance beamsplitters. Also design and manufacturing of polarizing cube beam splitters as well as of polarization obtaining cube beam splitters can be realized. Please note that such special components must always be manufactured according to customer requirements. Hence, these components cannot be listed in detail in our website. So if you search for such kind of optics, please use our inquiry form to request a quote for such specialty beam splitters.
We are specialized in rapid manufacturing and delivery of our beam splitters with custom dimensions. Usually we manufacture and deliver individually sized optics just as fast or even faster than stock optics with fixed dimensions can be shipped. This also and particularly applies to large production quantities. If you are in our time zone and there are no queries, you normally will receive our quotation within a few minutes. Our goal is that you exactly get the optics you need, so that the beam splitter perfectly fits into your application. You will therefore not find a shopping cart for standard products on our website.
To request a quote for one of our DST beam splitters with individual dimensions, please click on the button below.
DST300 Beamsplitters, transmittance
DST500 Beamsplitters, transmittance
DST700 Beamsplitters, transmittance
(Incidence angle i = 45° / random polarization)