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.
Ball lenses are spheres of optical glass ranging in size from 0.250 mm to 25 mm. They are used as fiber interconnects in telecom and expanded beam connectors. Large ball lenses have been successfully used as collectors in LED lighting systems and medical devices.
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.
A thermally insulating, broadband electromagnetic transmitting shield for satellite systems.
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®.
A cold mirror reflects short wavelengths and transmits longer wavelengths. It functions as a mirror to the ‘cold’ or short wavelengths.
A hot mirror reflects long wavelengths and transmits shorter wavelengths. It functions as a mirror to the ‘heat’ or long wavelengths.
DSI’s new line of high laser damage threshold (LDT) coatings is designed for use with lasers and other high energy systems. They are ideal for use in diode, diode-pumped solid-state (DPSS), and gas lasers.
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.
Optical filters that have a pattern in the filter. Patterned optical filters are typically manufactured using photolithography. Patterned dichroic filters are used in multispectral and hyperspectral systems.
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.
DSI HAS DEVELOPED HUNDREDS OF UNIQUE, SUCCESSFUL COATINGS
As a global leader in the development, deposition and delivery of precision, ultra-durable optical thin films, DSI provides coatings for a host of commercial and industrial applications including:
Aerospace & Defense Products
Industrial IR & UV Curing Filters
Wafer Level Processing
LED Marine Signaling
Ophthalmic Lens Coatings
Space & Satellite
LET DSI HELP SOLVE YOUR PROBLEM
DSI has the expertise to participate at any level of your product development. From engineering to prototyping to full-scale manufacturing, we will work with you to develop practical specifications, designs, and manufacturing techniques to meet your requirements.
· TEST AND MEASUREMENT
· INFRASTRUCTURE SUPPORT
Quality testing capabilities include measurement of in-house produced materials as well as the independent verification of external coated and uncoated samples for vendor/supplier surveillance, process analysis, and qualification testing. Our quality system is ISO 9001:2008 certified and ITAR registered and compliant. Below is a summary of some of our test and measurement capabilities.
Spectral Measurement Capabilities
· Spectral Range 0.190 – 50 microns
· Reflectance and Transmittance (near normal to 45 degrees)
· Cryogenic Measurements (ambient to < 10 kelvin)
· Polarized Measurements (S&P)
· Hemispherical Transmittance and Reflectance (0.2 – 2.5 microns)
· Flatness/Reflected Wavefront Error (capable of ± 0.05 waves, peak to valley @ 632.8 nm on up to 4″ diameter samples)
· Surface Quality Characterization (scratch/dig, scatter, BRDF)
· Surface Resistivity (0 – 1 Mega Ohm/sq)
· Dimensional verification (± 0.5 microns)
Environmental Testing can be performed in accordance with various military specifications, including MIL-C-48497 and MIL-F-48616.