THORLABS FELH0650 Longpass Filter Wavelength 25.0

( Brand: Thorlabs ), ( Part Type: Filter ), ( Manufacturer Part Number: FELH0650 )

Review THORLABS 25.0mm Longpass Filter Cut on Wavelength 650 Nm

The Thorlabs FELH0650 longpass filter is an optically superior solution designed to pass wavelengths longer than its specified cut-on wavelength of 650 nm with high efficiency. This filter is an essential component for various applications in the fields of optics, spectroscopy, and photonics, where separating and filtering specific wavelengths is crucial.

The FELH0650 filter is made of high-quality Schott BG39 glass, which is known for its excellent transmission properties in the near-infrared region. This material provides excellent color stability and high transmittance in the longer wavelengths, making it an ideal choice for applications that require efficient longpass filtering.

The filter's thickness is 25.0 mm, providing a sufficient optical path length for effective longpass filtering. Its rectangular shape with dimensions of 25.4 x 25.4 mm makes it compatible with standard optical components and setups. The filter's surface is anti-reflection coated on both sides to minimize reflective losses and maximize transmitted light.

The FELH0650 filter exhibits a high transmittance of over 80% for wavelengths longer than 650 nm, while rejecting over 95% of wavelengths shorter than 650 nm. This high rejection of shorter wavelengths ensures that the filter is highly selective, allowing only the desired longer wavelengths to pass.

The filter's robust construction ensures its durability and stability under various environmental conditions. Its Schott glass material has a high thermal stability, making it suitable for temperature-sensitive applications. Additionally, the filter's optical properties remain stable over an extended range of temperatures and wavelengths.

The FELH0650 filter is an excellent addition to any optics setup that requires efficient longpass filtering of light at a wavelength of 650 nm or longer. Its high transmission, high rejection, and robust construction make it an ideal choice for applications in fields such as spectroscopy, laser systems, and photonics, where precise filtering and wavelength selection are essential.

Pros and Cons of Buying Thorlabs FELH0650 25.0 Longpass Filter

Pro: This filter allows only wavelengths longer than 650 nm to pass through, making it ideal for applications where you want to block or filter out shorter wavelengths.

Pro: Thorlabs' FELH0650 filter boasts a high transmission efficiency of up to 95% at its cut-on wavelength, ensuring that the maximum amount of desired light is allowed to pass through.

Pro: With a bandwidth of 25.0 nm, this filter can accommodate a considerable range of wavelengths, making it suitable for various applications within the near-infrared region.

Pro: The filter is constructed using Schott BK7 glass, which is known for its excellent optical properties and resistance to scratches and other damages.

Pro: The FELH0650 filter is designed with edge parasitic light suppression, effectively reducing the amount of light that leaks around the edge of the filter.

Pro: This filter is compatible with various Thorlabs filter holder systems, allowing for easy integration into your experimental setup.

Con: The major drawback of using a longpass filter like the FELH0650 is that it will pass all wavelengths shorter than 650 nm, which may introduce unwanted background light in your experiments.

Con: Thorlabs' FELH0650 filter may be more expensive compared to some other filters on the market, due to its high quality and advanced features.

Con: The filter does not come with an automatic alignment feature, which could require additional time and effort during setup.

The Thorlabs FELH0650 25.0 longpass filter is a high-quality, versatile optical component suited for various applications in the near-infrared region. Its advantages, such as high transmission efficiency, wide bandwidth, and edge parasitic light suppression, make it an excellent choice for researchers and scientists seeking to filter or block shorter wavelengths.

However, the potential drawbacks, including the presence of background light due to its longpass nature, cost, and lack of automatic alignment, should be carefully considered before making a purchasing decision. Ultimately, if your experiment or application requires the specific wavelength range that this filter offers, its advantages outweigh the disadvantages, making it a worthwhile investment for your research or laboratory setup.

Details:

You are buying on 2 Two FELH0650 - 25.0mm Longpass Filter, Cut-On Wave length : 650 nm. This is in excellent condition.

part #: felh0650 prices

• $16.22-$48.22

specifications quakedental:

• brand: Thorlabs
• part type: Filter
• manufacturer part number: FELH0650

general quakedental:

• condition: New
• Business Industrial > Healthcare, Lab Dental > Other Healthcare, Lab Dental

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• started: August 25, 2025
• availability: In Stock
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• quantity: 1
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• # reviews: 512
• city: Sacramento, California

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