FILTER PRODUCTS

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FILTER PRODUCTS

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Longpass Filters

Magnetron sputtered hard oxide coatings on precision polished Fused Silica substrates provide deep rejection and a sharp transition to very high transmission. Suitable for high-temperature applications. Offered in three standard sizes, with custom sizes available on request.

Specifications

Diameter: 12.5 mm
Thickness: 1.5 mm
Transmission Wavelength Range: 325 – 2000 nm
Cut-On Wavelength: Not Specified
Transmission: 91 %
we have many types of standard filters in stock ,can send samples to your for test very fas . Filter are used for selecting or filtrating the specific wave band, they are widely used in optical instrument. industrial measurement, environment protection and many other application. We can provides short filter,long pass filter,band ...

Specifications

Diameter: 25 mm
Thickness: 1 mm
Transmission Wavelength Range: 260 – 1100 nm
Cut-On Wavelength: 260 nm
Transmission: 95 %
Shortpass filters are designed to transmit wavelengths lower than the cut off point and reflect all higher wavelengths. Knight Optical\'s Dichroic filters are comprised of a thin-film dielectric coating on glass, resulting in sharp transitions between the transmitted and reflected bands. With negligible absorption, this type of ...

Specifications

Diameter: Not Specified
Thickness: 1.1 mm
Transmission Wavelength Range: 368 – 500 nm
Cut-On Wavelength: 500 nm
Transmission: 95 %
Longpass filters are designed to transmit wavelengths higher than the cut on point and reflect all lower wavelengths. These dichroic longpass filters consist of thin-film dielectric coatings on glass with sharp transitions between the transmitted and reflected bands. Having negligible absorption they are suitable for high powers and ...

Specifications

Diameter: 12.5 mm
Thickness: 1.1 mm
Transmission Wavelength Range: 615 – 2600 nm
Cut-On Wavelength: 615 nm
Transmission: 95 %
Longpass filters are designed to transmit wavelengths higher than the cut on point and reflect all lower wavelengths. These dichroic longpass filters consist of thin-film dielectric coatings on glass with sharp transitions between the transmitted and reflected bands. Having negligible absorption they are suitable for high powers and ...

Specifications

Diameter: 0 mm
Thickness: 1.1 mm
Transmission Wavelength Range: 521 – 2600 nm
Cut-On Wavelength: 521 nm
Transmission: 95 %
Longpass filters are designed to transmit wavelengths higher than the cut on point and reflect all lower wavelengths. These dichroic longpass filters consist of thin-film dielectric coatings on glass with sharp transitions between the transmitted and reflected bands. Having negligible absorption they are suitable for high powers and ...

Specifications

Diameter: 0 mm
Thickness: 1.1 mm
Transmission Wavelength Range: 645 – 2600 nm
Cut-On Wavelength: 645 nm
Transmission: 95 %
Longpass filters are designed to transmit wavelengths higher than the cut on point and reflect all lower wavelengths. These dichroic longpass filters consist of thin-film dielectric coatings on glass with sharp transitions between the transmitted and reflected bands. Having negligible absorption they are suitable for high powers and ...

Specifications

Diameter: 0 mm
Thickness: 1.1 mm
Transmission Wavelength Range: 635 – 2600 nm
Cut-On Wavelength: 635 nm
Transmission: 95 %
Longpass filters are designed to transmit wavelengths higher than the cut on point and reflect all lower wavelengths. These dichroic longpass filters consist of thin-film dielectric coatings on glass with sharp transitions between the transmitted and reflected bands. Having negligible absorption they are suitable for high powers and ...

Specifications

Diameter: 12.5 mm
Thickness: 1.1 mm
Transmission Wavelength Range: 420 – 2600 nm
Cut-On Wavelength: 420 nm
Transmission: 95 %
Longpass filters are designed to transmit wavelengths higher than the cut on point and reflect all lower wavelengths. These dichroic longpass filters consist of thin-film dielectric coatings on glass with sharp transitions between the transmitted and reflected bands. Having negligible absorption they are suitable for high powers and ...

Specifications

Diameter: 12.5 mm
Thickness: 1.1 mm
Transmission Wavelength Range: 480 – 2600 nm
Cut-On Wavelength: 480 nm
Transmission: 95 %
Longpass filters are designed to transmit wavelengths higher than the cut on point and reflect all lower wavelengths. These dichroic longpass filters consist of thin-film dielectric coatings on glass with sharp transitions between the transmitted and reflected bands. Having negligible absorption they are suitable for high powers and ...

Specifications

Diameter: 12.5 mm
Thickness: 1.1 mm
Transmission Wavelength Range: 540 – 2600 nm
Cut-On Wavelength: 540 nm
Transmission: 95 %
Longpass filters are designed to transmit wavelengths higher than the cut on point and reflect all lower wavelengths. These dichroic longpass filters consist of thin-film dielectric coatings on glass with sharp transitions between the transmitted and reflected bands. Having negligible absorption they are suitable for high powers and ...

Specifications

Diameter: 12.5 mm
Thickness: 1.1 mm
Transmission Wavelength Range: 581 – 2600 nm
Cut-On Wavelength: 581 nm
Transmission: 95 %
Longpass filters are designed to transmit wavelengths higher than the cut on point and reflect all lower wavelengths. These dichroic longpass filters consist of thin-film dielectric coatings on glass with sharp transitions between the transmitted and reflected bands. Having negligible absorption they are suitable for high powers and ...

Specifications

Diameter: 25 mm
Thickness: 1.1 mm
Transmission Wavelength Range: 600 – 2600 nm
Cut-On Wavelength: 600 nm
Transmission: 95 %
Longpass filters are designed to transmit wavelengths higher than the cut on point and reflect all lower wavelengths. These dichroic longpass filters consist of thin-film dielectric coatings on glass with sharp transitions between the transmitted and reflected bands. Having negligible absorption they are suitable for high powers and ...

Specifications

Diameter: 12.5 mm
Thickness: 1.1 mm
Transmission Wavelength Range: 750 – 2500 nm
Cut-On Wavelength: 750 nm
Transmission: 95 %

Longpass Filters: Precision Wavelength Selection for Advanced Optical Applications

Longpass filters are specialized optical components designed to transmit wavelengths longer than a specified cutoff point while effectively blocking shorter wavelengths. This selective transmission makes them indispensable in various scientific, industrial, and imaging applications where precise spectral control is essential.

Understanding Longpass Filters

A longpass filter operates by allowing light above a certain cutoff wavelength to pass through while attenuating shorter wavelengths. The cutoff wavelength is the point at which the filter transitions from high transmission to high blocking. These filters are typically constructed using dielectric coatings or absorptive colored glass, providing sharp spectral transitions and high optical performance.

Key Features and Advantages

  • Selective Wavelength Transmission: Longpass filters offer precise control over the transmitted spectral range, enabling the isolation of desired wavelengths for specific applications.

  • High Transmission Efficiency: They provide high transmission of desired wavelengths, ensuring minimal signal loss and optimal system performance.

  • Sharp Cutoff Characteristics: The filters exhibit steep transition slopes between the blocking and transmission regions, allowing for accurate spectral separation.

  • Durability and Stability: Constructed with robust materials and coatings, longpass filters maintain their optical properties under varying environmental conditions.

Applications Across Industries

Longpass filters are utilized in a wide range of applications due to their ability to manage light with precision:

  • Fluorescence Microscopy: In biological and medical research, longpass filters are used to separate emitted fluorescence from excitation light, enhancing image clarity and contrast.

  • Spectroscopy: They help isolate specific spectral regions, improving measurement accuracy and signal-to-noise ratios in analytical instruments.

  • Machine Vision: In industrial automation, longpass filters enhance image contrast by blocking unwanted ambient light, facilitating accurate inspection and quality control.

  • Laser Systems: Longpass filters manage beam paths and control wavelength components, ensuring precise operation in laser-based applications.

  • Photography and Imaging: They are employed to block ultraviolet or blue light, improving color reproduction and image sharpness in cameras and imaging devices.

  • Environmental Monitoring: Longpass filters assist in analyzing specific wavelengths reflected from natural surfaces, aiding in the assessment of vegetation health, water quality, and atmospheric conditions.

Selecting the Right Longpass Filter

When choosing a longpass filter, consider the following factors to ensure optimal performance:

  • Cutoff Wavelength: Determine the specific wavelength at which the filter transitions from blocking to transmission, aligning with the application's requirements.

  • Transmission and Blocking Efficiency: Evaluate the filter's ability to transmit desired wavelengths while effectively blocking unwanted ones.

  • Angle of Incidence: Ensure the filter is designed for the angle at which light will enter, as performance can vary with angle.

  • Environmental Conditions: Select filters with appropriate durability and stability to withstand the operational environment, including temperature and humidity variations.

Conclusion

Longpass filters are vital components in modern optical systems, offering precise control over light transmission and blocking. Their ability to selectively manage wavelengths makes them essential in applications ranging from scientific research to industrial automation. By understanding their features and applications, users can effectively integrate longpass filters into their systems to achieve enhanced performance and accuracy.

Did You know?

Optical filters selectively transmit light in a particular range of wavelengths. When designed to pass long wavelengths only, they are referred to as longpass filters. Longpass filters are designed to attenuate shorter wavelengths and transmit longer wavelengths over the active range of the target spectrum. Because they isolate specific wavelengths, longpass filters are desirable in systems where they can be used to trim exess wavelengths or stray light to reduce unwanted near band emissions. Longpass filters are useful in a variety of applications and can be used in combination with shortpass filters for custom bandpass filtering.