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Longpass / Highpass Filters

Optical Materials

Longpass / Highpass Filters

Item Number : KTOM-LHF

Price varies based on specs and customizations


Light transmission range
470-1200nm
Transmittance
>90%
material
Ultra-white glass
ISO & CE icon

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Longpass filter

Longpass filters are used to transmit light longer than the cutoff wavelength and shield light shorter than the cutoff wavelength by absorption or reflection. Long-pass filters have many applications, and combined with short-pass filters, they can realize the function of adjustable band-pass filters.Longpass filters are designed to have a sharp transition from reflection to transmission, making them ideal for various applications. 

Detail & Parts

460nm Longpass filters
460nm Longpass filters

 

High-pass filter with durable dielectric coating
High-pass filter with durable dielectric coating
High-pass filter with extremely strong light transmittance
High-pass filter with extremely strong light transmittance
High pass filter anti-corrosion
High pass filter anti-corrosion

Types of Longpass

Standard Longpass

  1. Coatings get thicker and more expensive at higher cuton wavelengths and for extended blocking ranges
  2. Cuton wavelengths 250-1200 nm
  3. Size 2-90 mm

UV filters

  1. The manufacture of UV filters poses a unique set of challenges
  2. Wavelengths 175-400 nm

Applications of Longpass

  • lasers
  • Precision optical instruments,
  • optical systems
  • video cameras
  • camera lenses
  • green light film

Provide customized services

Through the implementation of innovative and state-of-the-art melting processes, we have acquired extensive expertise in the development and manufacture of quality glass products, offering a wide range of optical glass products for a variety of commercial, industrial and scientific applications. The company provides various specifications of optical glass such as raw glass, cut parts and finished components, and cooperates closely with customers to customize products according to customer needs. With an unwavering commitment to quality, we ensure our customers receive the perfect solution tailored to their requirements.

For further quotations, please contact us.

FAQ

What is an optical bandpass filter?

An optical bandpass filter is an engineered optical filter designed to isolate a specific range of wavelengths, allowing only those wavelengths to pass through while blocking all others.

What is a Longpass filter?

Long pass filters, sometimes referred to as long pass edge filters, are designed to transmit wavelengths within a given wavelength range. This band is defined by the filter's cut-on edge which essentially blocks frequencies shorter than the specified edge wavelength.

What is the difference between longpass and shortpass filter?

Shortpass filter transmits light within wavelengths that are shorter than the cut-off wavelength of the filter and cuts longer wavelengths. Longpass filter transmits wavelengths longer than the filters' cut-off wavelength and cuts shorter wavelenths.

What is a high pass filter best for?

One of the most common uses for a high-pass filter is to remove unwanted low frequencies from a mix. This can include sub bass frequencies outside the range of most speakers or low frequency noise like hums or rumbles.

What are the main types of optical bandpass filters?

The main types of optical bandpass filters include narrow band filters, shortpass filters, longpass filters, optical windows, and specialized filters like barium fluoride substrates.

What is optical glass used for?

Due to its exceptional level of clarity and durability, optical glass is the most commonly used material for a wide variety of optical applications, including: Lenses for analytical and medical equipment. Photographic lenses. Windows for optical systems and instruments.

How does an optical bandpass filter work?

Optical bandpass filters work by using multilayer dielectric thin films to modulate the optical properties of specific wavelength bands. These films are designed to reflect or absorb wavelengths outside the desired range, allowing only the targeted wavelengths to pass through.

What is the composition of optical glass?

About 95% of all glasses are of the "soda-lime" type, containing silicon dioxide (silica), Na2O (soda), and CaO (lime). Crown glass is a soda-lime-silica composite.

What are the advantages of using optical bandpass filters?

Optical bandpass filters offer advantages such as high spectral selectivity, allowing precise control over the wavelengths that pass through. They are also designed for high transmission, angular insensitivity, and sideband elimination, making them versatile for various optical applications.

What are the most common optical glasses?

The most common optical glasses for the IR spectrum are calcium fluoride, fused silica, germanium, magnesium fluoride, potassium bromide, sapphire, silicon, sodium chloride, zinc selenide, and zinc sulfide.

Where are optical bandpass filters commonly used?

Optical bandpass filters are commonly used in imaging and machine vision systems, biometrics, telecommunications, astronomy, and other fields where precise wavelength control is essential.

What makes narrow band filters unique?

Narrow band filters are unique because they have a square top over their pass band, allowing more energy to pass through the filter. This shape can be further enhanced by using three materials in the filter's construction, making the pass band even more precise.

How do shortpass filters differ from longpass filters?

Shortpass filters transmit light with wavelengths shorter than a specified cutoff wavelength, blocking longer wavelengths. In contrast, longpass filters transmit light longer than the cutoff wavelength, blocking shorter wavelengths.

What are the applications of optical windows?

Optical windows are used in high-power IR laser and microwave applications due to their exceptional broad band infrared transparency, excellent thermal conductivity, and low scattering in the infrared spectrum.

How does the design of optical bandpass filters impact performance?

The design of optical bandpass filters is highly sensitive to film thickness variations. Significant changes in film thickness can reduce the overall optical performance, affecting the filter's ability to precisely control the wavelengths that pass through.
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4.8

out of

5

I was amazed by how quickly these filters were delivered. I received them within three days of placing my order, which is incredibly fast.

Joelle Boudreaux

4.9

out of

5

I was pleasantly surprised by the quality of these filters. They are very well-made and seem like they will last a long time.

Jacklyn Labadie

4.7

out of

5

These filters offer exceptional value for money. They are very affordable, but they don't sacrifice quality.

Robert Cartier

4.8

out of

5

I'm very impressed with the durability of these filters. I've been using them for several months now, and they still look brand new.

Dominique Leblanc

4.9

out of

5

These filters are technologically advanced and offer features that I haven't seen in other filters. I'm very happy with my purchase.

Michel Richard

4.7

out of

5

I highly recommend these filters to anyone who needs high-quality filters at an affordable price.

Sandrine Moreau

4.8

out of

5

I'm very satisfied with these filters. They perform as advertised and have improved the quality of my images.

Jean-Pierre Dubois

4.9

out of

5

These filters are a great value for the price. They are well-made and produce excellent results.

Marie-Claire Martin

4.7

out of

5

I'm impressed with the durability of these filters. They've held up well, even after extensive use.

Paul Durand

4.8

out of

5

I highly recommend these filters for anyone looking for high-quality, affordable filters.

Anne-Sophie Petit

4.9

out of

5

These filters are a great addition to my photography kit. They help me capture stunning images.

Mathieu Dubois

4.7

out of

5

I'm very happy with these filters. They've improved the quality of my images and made my photography more enjoyable.

Julie Lefebvre

4.8

out of

5

I highly recommend these filters to anyone who wants to take their photography to the next level.

Alexandre Moreau

4.9

out of

5

These filters are a must-have for any photographer. They're affordable, well-made, and produce amazing results.

Emilie Durand

PDF - Longpass / Highpass Filters

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Catalog of Optical Materials

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Catalog of Optical Bandpass Filter

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Catalog of Optical Material

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