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GoPhotonics offers a broad selection of Optical Filters designed to selectively transmit, block, or separate specific wavelengths across the vacuum ultraviolet (VUV), ultraviolet (UV), visible, and infrared spectral regions. These filters support applications requiring precise wavelength selection, spectral isolation, and controlled light transmission in spectroscopy, imaging, gas analysis, optical instrumentation, and laser-based systems.

The featured portfolio includes interference band-pass filters, longpass filters, linear variable filters, vacuum ultraviolet filters, and wavelength separator filters. With characteristics such as narrow spectral bandwidths, high optical density blocking, steep spectral transitions, and advanced thin-film coatings, these filters enable accurate management of optical signals across a wide range of photonic applications.

Knight Optical: UV Interference Band-Pass Filter for 220 nm Wavelength Selection

The 220FIB12 from Knight Optical is a UV interference band-pass optical filter designed for transmission at a central wavelength of 220 nm. The filter has a bandwidth (FWHM) of 14 nm and provides peak transmission of 16%, enabling selective transmission within the deep ultraviolet region.

To suppress unwanted wavelengths, the filter provides average blocking from 200 nm to 1150 nm with an optical density of OD4 (0.01%). It features an 8.5 mm aperture and is supplied in a hermetically sealed assembly mounted in a black anodized aluminum ring measuring Ø12.5 mm × 6.1 mm. The compact design makes it suitable for optical systems requiring narrowband filtering at deep UV wavelengths.

Newport: Longpass Filter with Steep Spectral Transition

The 10CGA-385 from Newport is a 1-inch diameter colored-glass alternative longpass filter with a cut-on wavelength of 385 ± 5 nm. Designed as an alternative to conventional colored-glass filters, it provides a significantly steeper transition between the transmission and blocking regions, enabling improved wavelength separation.

The filter has a refractive index of 1.75 and provides out-of-band rejection below 360 nm. Its spectral characteristics make it suitable for OEM optical systems that require efficient blocking of shorter wavelengths while transmitting longer wavelength light.

eSource Optics: Vacuum Ultraviolet Bandpass Filter for 150 nm Applications

The 12150FNB from eSource Optics is a vacuum ultraviolet (VUV) bandpass filter designed for transmission at a peak wavelength of 150 nm. The filter has a bandwidth (FWHM) of 20 nm and a wavelength tolerance of ±2.5 nm, providing narrowband filtering in the VUV region.

It delivers a minimum peak transmission of 15% and suppresses wavelengths from the ultraviolet through the far-infrared region to approximately 10^-3 transmission. The filter features an 80% central clear aperture, parallelism of 5 arc minutes, and an edge chamfer of approximately 0.5 mm x 45°. Available in an unmounted, open-faced configuration, it has a diameter of 12.7 mm ±0.25 mm and thickness options ranging from 1.5 mm to 5 mm, making it suitable for vacuum ultraviolet optical systems and instrumentation.

Vortex Optical Coatings: Linear Variable Filter for Spectroscopy and Gas Analysis

The LVF 0.9-1.7-3.5-15-0.5-2% from Vortex Optical Coatings is a linear variable optical filter that provides wavelength transmission across the 0.9 µm to 1.7 µm spectral range. The filter offers transmission between 50% and 75% within the passband while maintaining an average optical density greater than 2.5 outside the transmission region.

Its bandwidth is specified as 2% of the center wavelength, while the wavelength gradient changes at a rate of 60 nm/mm across the filter length. The filter operates at normal incidence (0°) and provides blocking from the ultraviolet through the near-infrared region. With dimensions of 15 mm x 3.5 mm x 0.5 mm and surface quality better than 60-40 scratch-dig, it is designed for compact mini spectrometers, gas analysis systems, and plastics identification applications.

OPTOMAN: Mid-Infrared Wavelength Separator Filter

The PP-IRFS-12.7-2.0-DM85-AR131 from OPTOMAN is a wavelength separator optical filter manufactured on a mid-IR grade fused silica substrate. The filter has a diameter of 12.7 mm, thickness of 2 mm, and a clear aperture greater than 90%. The reflective surface utilizes ion beam sputtering coating technology to achieve reflectance above 99% for p-polarized light and transmittance greater than 97% for s-polarized light. The anti-reflective surface provides reflectance below 0.75% for p-polarized light. Additional specifications include surface quality of 10-5 scratch-dig on both surfaces, surface flatness up to λ/2 at 633 nm, parallelism up to 30 arcsec, and a protective chamfer of 0.2–0.3 mm x 45°. The filter is designed for operation at an angle of incidence of 17° and provides efficient wavelength separation in optical systems operating in the mid-infrared region.

Supporting Precise Spectral Filtering Across Multiple Wavelength Regions

Optical filters are critical components for managing light transmission and achieving wavelength-specific performance in photonic systems. The solutions featured on GoPhotonics span wavelength regions ranging from the vacuum ultraviolet to the infrared and incorporate a variety of filtering technologies tailored to specific spectral requirements.

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