Standard 1200nm-11400nm Optical Infrared IR Longpass Filter  Overview

Optical infrared IR longpass filter is an optical filter which can block the short near infrared wavelength and transmit the infrared long wavelength. Coligh is a China manufacturer of optical infrared IR longpass filters.

We have mature experience of manufacturing various optical infrared ir longpass filters for applications like thermal imaging, NIR spectroscopy, gas detection and infrared biomedicals.

Now we are offering hundreds of different infrared wavelengths for clients with different sizes. The largest size in stock is Dia150mm and the the smallest can be 1.5*1.5mm.  To meet the rapid delivery needs of prototype building. Almost all in-stock products can be delivered within 7-10 days, we can cut and roll the filter to any size smaller than 150mm. Also we can choose the best suiting filter size according to client’s application and requirement. Shortening lead times and providing rapid and cost-effective support for R&D and mass production.

Our optical infrared ir longpass filters offer the following features:

• Precise control on the cut on wavelength. Allownace for the wavelength is usually 50% cut on wavelength +/-50nm
• Wide transmission band from hundreds of nanometers to thousand of manometers.
• High peak transmissions. Typically peak transmission is 85% 90%  according to specified wavelength
• Wide blocking wavelength from SWIR to FIR.
• Deep blocking depth OD>=2 which allows a high signal ratio
• Various substrate option: various from silicon to sapphire and ZnS

Tin Film Coating Process of 1200nm-11400nm Optical Infrared IR Longpass Filter

We ultilize thin film hard coating for all the optical infrared ir longpass filters.

• Hard coatings have an extremely high density and are not easily affected by humidity or temperature fluctuations.
• Applying hard coatings to infrared longpass filters ensures high transmittance, a long cutoff, and effective stray light isolation within the operating band.
• Hard coatings offer exceptional wear and corrosion resistance, withstanding the mechanical friction of daily operation and resistant to chemical corrosion.
• Due to the properties of the hard coating, hard-coated filters have a higher laser damage threshold and are well suited for medium- and high-power infrared laser systems.

 

Material Substrate Of 1200nm-11400nm Optical Infrared IR Longpass Filter

Among all the infrared long-pass filters, we select sapphire, silicon, and zinc selenide as substrate materials based on their various material properties.

• Silicon is our preferred material, offering excellent transmittance in the 1.2-8μm band and excellent performance in the mid-infrared and long-wave infrared bands. Silicon’s inherent physical properties make it particularly well-suited for high-power infrared systems or those requiring heat dissipation. Furthermore, its low density and lightweight nature make it suitable for applications such as infrared detector windows, thermal imaging systems, and drone infrared cameras.
• Sapphire is another material of choice. With excellent transmittance from the ultraviolet to the mid-infrared, it is well-suited for filter design in the short-wave infrared to mid-wave infrared range. Furthermore, its high hardness, second only to diamond, makes it suitable for use in harsh environments. Furthermore, sapphire is extremely chemically stable, resistant to acids, alkalis, and corrosion, making it suitable for outdoor use or high-humidity environments.
• Zinc selenide is also used as a substrate in our infrared long-pass filters, but in a smaller proportion. Zinc selenide has an ultra-wide transmittance range, with good transmittance from 0.5-20um, which facilitates dual-band imaging in the visible and infrared bands.

Custom Capability Of 1200nm-11400nm Optical Infrared IR Longpass Filter

We offer flexible custom service for optical infrared ir longpass filters.

• Any center wavelength within the 1200-11400nm range
• Cut-off depths of OD2, OD3 are available
• Sizes available are round or square
• Material options include fused silica, colored glass, and more.
• Custom orders can be completed within two weeks.

Part Of The Spectrum Of 1200nm-11400nm Optical Infrared IR Longpass Filter

1200nm-11400nm Optical Infrared IR Longpass Filter Stock List

1200nm-11400nm Optical Infrared IR Longpass Filter  Applications

• Infrared Thermal Imaging
  Infrared longpass filters can block interference from visible light. When used for infrared imaging, they can be used in night vision devices, infrared thermal imagers, or infrared guidance systems. This helps both humans and machines identify targets at night and in harsh environments.
• Scientific Research Equipment
  The 1200-11400nm wavelength covers a rich molecular vibration absorption region. Longpass infrared filters can be used with FTIR spectrometers, Raman systems, and laboratory infrared detection equipment to study material properties and molecular structures and obtain more accurate spectral data.
• Gas Analysis
  Different gases have different absorption peaks in the infrared band. Infrared longpass filters can block visible light and some short infrared light. They can be used with infrared sensors or spectrometers for atmospheric pollution detection and industrial emissions monitoring.