These coatings reduce the reflection from the surface of an optic. They are used to increase the throughput of the optical system and to reduce ‘ghosting’ and parasitic back reflections in an optical system.
A filter that has high transmission in one spectral region and low transmission at longer and shorter wavelengths. Bandpass filters are commonly used to trim the output of a light source or the input of a detector.
Beamsplitters selectively reflect a percentage of light and transmit a percentage of light.
These filters are designed to improve the performance of CCD (charge-coupled device) chips. They act to trim the input to a CCD chip, reducing noise in a system.
DSI offers extremely durable, non-absorbing, and complex thin film coatings on plastics. Single band, multi-band, and wide band multi-layer, anti-reflection coatings on engineered plastics are utilized in medical optics, UAV sensor suites, telecom, CPV solar systems, and more.
These filters are used to change the color of a light source.
Covert filters transmit infrared (IR) wavelengths and reflect or absorb visible light. They allow an area to be illuminated with infrared light so it can be viewed with night vision equipment or IR cameras.
A dark mirror is a low reflective, low transmissive filter. Dark mirrors are used as the base for DSI Spectral Metal.
Dichroic, meaning two color, filters reflect certain wavelengths of light and transmit other wavelengths of light. These filters can be manufactured to reflect short wavelengths of light and transmit the longer wavelengths or transmit the shorter wavelengths and reflect the longer wavelengths.
These are dichroic filters with specific requirements for the placement and slope of the band edge.
Coatings that can withstand either high temperature spikes or high continuous operating temperatures. DSI calls this line of coatings by the trade name Heatbuster®.
Coatings that operate beyond the visible spectrum, typically from 800 nm to 50 µm.
A family of indium tin oxide (ITO) coatings that transmit wavelengths of light and are electrically conductive. IM ITO (index-matched ITO) coatings are matched into the exit medium to yield higher transmission. Common applications are electro-static discharge and window heaters.
DSI has had many years of experience making LWIR filters that operate at any temperature between ambient and 10°K. These coatings are durable and robust optical filters, made using physical vapor deposition. The band edge placement can be held with great precision.
Infrared coatings experience a shift in spectral placement with changes in temperature. For example, a relative center wavelength (CWL) shift of 100 ppm / ˚C is common for narrow bandpass (NBP) filters in the 3 to 18μm wavelength region. DSI’s “Low Temperature Shift” IR coatings shift approximately half the amount of “Standard” IR coatings.
Coatings comprised of metals. Commonly deposited metals include, gold, silver, nickel, chrome, and aluminum.
DSI is offering optical assembly technology that combines individually coated filter substrates into an array assembly. These array assemblies range from a two-filter stack to an eight-filter stack or more and can employ a variety of adhesives, including space-qualified adhesives.
A coating that has a relatively flat absorption curve throughout a section of the spectrum.
A coating that has high reflection in a narrow portion of the spectrum and high transmission at shorter and longer wavelengths. A common application is laser eye protection.
A reflective optical device.
A type of notch filter that contains multiple notches. Rugate filters are used primarily for laser eye protection.
The DSI trade name for a family of coatings on metal that selectively reflect and absorb light. Spectral Metal can be cut and formed after coating, allowing the system designer to use complex concave shapes within a low cost system. Spectral Metal is used in the UV printing and curing industry, medical imaging and LED systems.
These filters block the ultraviolet (UV) and transmit the visible spectrum. These filters are used to prevent UV adhesives from curing prematurely, to slow spoilage in fresh produce, and to protect fine artwork.
DSI’s very long wavelength infrared (VLWIR) filters provide high transmittance over the 12μm to beyond 22μm wavelength region. These coatings readily pass all standard environmental tests, and can be repeatedly cycled between ambient and cryogenic temperatures without degradation.
These are filters that operate in the visible spectrum between 400 nm and 780 nm.