Dichroic Filters

What is Dichroic Filter?

Dichroic filters, also known as dichroic mirrors or dichroic beamsplitters, utilize thin-film interference, have a unique color effect, and can selectively reflect or pass through specific wavelengths of light. These filters offer various advantages, including long lifetime, wide passband range, low heat generation, high laser damage threshold, and ease of integration, making them highly valuable in diverse optical systems. Their significant applications span across fields like fluorescence microscopy, lasers, lidar, flow cytometry, and optical sensors.

ITEM NoAngle of incidence PassbandCut-off bandDiaphragm SizeSubstrateMembrane material
DIC47545T>90%@482-750R>90%@439-46729.8*29.8*(2.0±0.05)FS 7980 0FTa2O5/SiO2
DIC50545T>93%@510-745R>90%@380-49829.8*29.8*(2.0±0.1)FS 7980 0FTa2O5/SiO2
DIC48845T>93%@507-850R>95%@400-49547.8*42.3*(0.9~1.0)FS 7980 0FTa2O5/SiO2
DIC45045T>93%@465-700R>98%@390-42029.8*29.8*(2.05±0.05)FS 7980 0FTa2O5/SiO2
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Know-how about Dichroic Filters

How Dichroic Filters Works?


Dichroic filters leverage the principle of thin-film interference, where alternating layers of optical coatings with varying refractive indices are deposited on a glass substrate. This design enables selective enhancement or interference with specific wavelengths of light. By adjusting the thickness and quantity of these layers, the passband frequency of the filter can be tailored to be wider or narrower as needed. A notable difference from conventional optical filters is that dichroic filters reflect undesired wavelengths of light instead of absorbing them, resulting in more efficient and versatile light control.


What is the Benefits of Dichroic Fillters


A dichroic filter, which refers to a variety of dichroic mirrors and dichroic beamsplitters offers various advantages, and the prominent ones are as follows:

  • Long Lifespan: Due to their inherent rigidity and fine layer structure, dichroic filters have a much longer lifetime than other types of filters.
  • Wide Passband: Dichroic filters can be fabricated to pass any passband frequency and block a selected number of stopband frequencies, which makes them highly customizable to meet the different optical requirements.
  • Less Heat: Dichroic filters possess the advantage of generating significantly lower heat compared to conventional filters. As they reflect light within the stopband rather than absorbing it, they exhibit enhanced thermal stability, especially in high-power optical systems.
  • High Laser Damage Threshold: Dichroic filters can achieve very high laser damage thresholds and are thus advantageous in applications such as high-power lasers.
  • Easy to integrate: Dichroic filters can be easily integrated with other optical components (such as lenses, mirrors, etc.), making them flexible for use in optical systems.
  • Extensive Applications: Due to their selective transmission and wide wavelength range, dichroic filters are widely used in various fields, including fluorescence microscopy, lasers, lidar, flow cytometry, optical sensors, etc.


Dichroic Filters Applications


Although different types of filters are usually used in combination in various optical applications, dichroic filters have overwhelming advantages in the following applications because of their unique optical properties:

  1. Fluorescence microscopy: Dichroic filters have high selectivity in fluorescence microscopy, which can selectively transmit or reflect fluorescent signals of specific wavelengths. This makes the observation and research of labeled samples more precise and efficient in the fields of biomedical research and life sciences.
  2. Lasers: Dichroic filters enable high wavelength selectivity and tuning range in lasers. They can be used to selectively transmit or reflect specific wavelengths of laser light to meet the wavelength selection requirements of different optical systems.
  3. Optical communication: In optical fiber communication systems, dichroic filters have high wavelength selectivity, which can adjust and select the wavelength of optical signals to meet different transmission requirements. This enables fiber optic communication systems to have better signal transmission and wavelength separation performance.
  4. Spectral analysis: Dichroic filters can selectively transmit or reflect spectral signals of specific wavelengths, thereby realizing spectral analysis and wavelength selection. This has an important role in spectroscopy applications, making spectral analysis more accurate and precise.
  5. LiDAR: In LiDAR systems, dichroic filters can achieve high laser light selectivity, which can selectively transmit or reflect specific wavelengths of laser light. This enables lidar systems to have better object detection and ranging performance.


How to Classify Dichroic Filters?


Dichroic filters are a type of optical filter, which can be divided into various types according to different designs and application requirements. Here are some common types of dichroic filters:

  • Dichroic Beamsplitter: Splits incoming light into two different wavelengths, often used in applications such as spectral analysis and laser interferometers.
  • Dichroic Beamsplitter: Splits incoming light into two light beams in different directions, usually used in applications such as laser interferometers and interferometric optical measurements.
  • Dichroic mirrors: selectively reflect light in a specific wavelength range, often used in applications such as lasers, optical sensors, and laser range finders.
  • Dichroic Prism: Splits incoming white light into different color bands, often used in applications such as projectors, spectrometers, color measurement, etc.


Why Dichroic Filter for Fluorescence Microscopy?


Dichroic filters are widely used in fluorescence microscopy and can be used to selectively observe many different fluorescent labels, enabling high-resolution imaging and the study of sample structure and function. At the same time, due to the long service life and high laser damage threshold of the dichroic filter, it can be applied to a high-power fluorescence microscope system, making observation and research more stable and reliable. Therefore, dichroic filters play a key role in fluorescence microscopy, providing a powerful tool for biomedical research and life sciences.


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FAQ, Frequently Asked Questions

Some important information you might want to know.

  • Do you offer standard optic components (Shelf Products) ?
    No, we don’t sell shelf products. We offer customization service according to your requirements for specific projects or brands equivalent.
  • What substrates do you use for custom optical components?
    Our most frequently used substrates are Zinc Selenide (ZnSe), Zinc Sulfide (ZnS), Silicon, Germanium (Ge), Copper, Aluminum, Mo, PMMA, Chalcogenide Glasses, etc.
  • Can you help to customize according to samples we offered?
    We highly recommend producing according to specific drawings. Since there are lots of indexes which can not be obtained by measuring samples, such as requirements of material.
  • What's your MOQ for customized projects?
    We set very low MOQ for customization projects. But of course, price will be quoted according to the quantity to cover our production cost.
  • How to protect my personal information and our technical information?
    Don’t worry, we will sign the NDA with all our customers if needed.
  • What shipping methods are available?
    We commonly use UPS, FedEx, DHL, TNT, SF, EMS etc. We also accept your own appointed forwarder.
  • What's the lead time for sampling, for mass production?
    For customization projects, sampling lead time will be 1 to 2 weeks. For mass production, 1 to 2 months for orders with quantity 1000 to 2000 pieces.
  • Can you offer all the Certificates required by our customs and our company?
    Every product that leaves the factory has been carefully tested. We would like to offer you all the certificates required by your side. Such as:
    • Raw material certificate and technical drawing
    • RoHS Report of substrate
    • Inspection report (data) of 3D optical profiler, surface flatness etc.
    All products delivered by us will be carefully cleaned and packaged.

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