Optical Filters

Avantier manufactures a wide range of custom optical filters, including hard coated dichroic filters and machine vision filters with excellent performance, ensuring optimal image contrast and accuracy by selectively transmitting specific wavelengths while blocking unwanted light. These filters are thin, offer high transmission, and are ideal for precision-demanding applications. We also produce colored glass filters with adjustable absorption and transmission. Additionally, we offer shortpass, longpass, and bandpass filters for various wavelength-selective needs.

OD4.0 Notch Filters: Avantier offers cost-effective OD4 notch filters with excellent laser rejection and wide transmission. Ideal for various applications with a remarkable OD4 rating for precise laser rejection.

OD6.0 Notch Filters: Avantier’s OD6 notch filters efficiently block specific wavelengths, achieving 93% transmission outside the target range, resulting in OD6 blocking (1 million attenuation).

Dichroic Filters:Avantier’s high-quality dichroic filters transmit specific wavelengths while reflecting others. Essential for optical systems, these thin-film optical filters find use in various applications.

Bandpass Filters: Avantier specializes in manufacturing clarity-focused bandpass filters, ideal for multiple industries, allowing a specific wavelength range while blocking others.

Narrow Bandpass filters: Avantier offers precision Narrow Bandpass Filters using cutting-edge plasma deposition technology. These optical filters have ultra-narrow passbands, low FWHM, deep blocking, and find applications in diverse fields, from laser technology to molecular biology. They play a crucial role in various applications such as laser cleanup, flow cytometry, DNA sequencing, and more.

Shortpass Filters: Avantier offers high-quality Shortpass Filters designed for precise light control. These optical filters allow shorter wavelengths while blocking longer ones. They find applications in various fields and can be customized.

Fluorescence Filters: Avantier excels in manufacturing top-quality fluorescence filters for high-definition imaging and precise microscopy in various applications, available as filter cubes and wheels.

Raman Filters: Avantier offers high-quality Raman filters for precision in Raman spectroscopy. These optical filters provide high transmission, steep edge, and deep optical blocking, enhancing accuracy. Avantier offers notch and edge filters for flexibility, along with laser line filters for laser beam cleaning.

Neutral Density Filters: Avantier offers Neutral Density Filters which are essential for photography and photometric measurements. They control light intensity without color distortion, enabling creative photography effects. A variety of high-quality options and custom solutions.

Laser Line Filters: Avantier’s Laser Line Filters offer precision optical solutions with ultrahigh transmission, narrow bandwidth, and excellent blocking capability. These optical filters enhance image contrast and eliminate unwanted light, ideal for applications like fluorescence instrumentation and Raman spectroscopy. Custom orders are welcomed.

UV Bandpass Filters: Avantier produces UV bandpass filters that are specialized optical components designed to selectively transmit ultraviolet (UV) light within specific wavelength ranges while blocking out-of-band signals.

Optical Filter Glass: Avantier offers high-quality Optical Filter Glass for scientific research and OEM applications. These optical filters selectively absorb or transmit specific light wavelengths, altering colors. They come in various types, cover a wide spectral range, and are precision polished.

Optical Glass Filters: Avantier’s Optical Glass Filters are precision-made from high-quality glass to control and modify light. They include color, ND, polarizing, UV, IR filters, and more, used for image enhancement and exposure control in various applications.

Optical Bandpass Filters: Avantier’s Optical Bandpass Filters, essential for biotech and laser applications, transmit specific wavelengths, defined by parameters like Center Wavelength (CWL) and Full Width at Half Maximum (FWHM). They offer various types, including All-Dielectric and Metal-Dielectric filters, suitable for tailored solutions.

Glass Bandpass Filters: Its spectral characteristic is composed of maximum transmissivity (TM) wavelength of the peak (lM), front-cut-off wavelength, behind-cut-off wavelength, and half-peak width. The wavelength corresponding to the half of the maximum transmissivity are l2 and l1. And the half-peak width is determined by l2 – l1. Band-Pass Filter Glass is named DTB, and wavelength of the peak is used as its serial number.

Color Temperature Insulating Filter Glass: Color Temperature Insulating Filter Glass belongs to the class of optical filters known as Color Temperature filters. The color temperature index ranges from 4000k to 5000k, with a Color index exceeding 90. The term “color temperature” originates from the fascinating phenomenon of warm objects emitting colored light. Objects with higher temperatures, such as a candle flame, emit light in deep red and orange hues.

Colored Filter Glass: We offer a wide variety of bandpass, longpass, and temperature-balancing filters in our colored glass filter line. Colored glass filters are known for their affordability and easy customization.

Key Specifications

When selecting the optimal optical filter for your application, there are several specifications to consider. The Cut-on Wavelength represents the point at which transmission reaches 50 percent in a longpass filter, while the Cut-off Wavelength is the point at which transmission reaches 50 percent in a shortpass filter. For edge filters, the slope is expressed as a percentage of the cut wavelength with designated starting and end points.

For example, a 600 nm filter with a 1 percent slope and start/end points at 10 percent and 80 percent transmission would transition over a 6 nm bandwidth. Optical density (OD) indicates the amount of light attenuated by the filter and is calculated based on the transmission percentage in the blocked region. Higher OD values indicate lower transmission. Fluorescence microscopy typically requires an optical density of 6 or greater, while laser separation and chemical detection need values in the 3-4 range. Filters with OD less than 2 are suitable for applications like color sorting or spectral separations. The Blocking Range denotes the wavelength range blocked by the filter, typically where transmission is below 50 percent. Bandwidth, also known as Full Width Half Maximum (FWHM), describes the portion of the spectrum transmitted through the filter, achieving more than 50 percent transmission. The Central Wavelength corresponds to the midpoint of the FWHM and may coincide with the point of maximum transmission, especially in traditional coated optic filters. The choice of optical coatings depends on the primary transmission range of your optical filter.

At Avantier, we offer a wide range of optical coatings suited to different wavelengths.

Custom Optical Filters for Diverse Applications

Our offers a comprehensive range of filter types including shortpass, longpass, bandpass, notch, dichroic, and interference filters, each designed to meet specific wavelength-selective needs and applications. Our filters are designed for a diverse range of applications, and we can also provide custom optical filters to fit your specific requirements. Please contact us if you’d like to schedule a consultation or request for quote on your next project on custom optical filters.