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China Suppliers Steep Blocking Long Pass Interference Filters from Factory - High Transmittance and Custom Options Available
Product Overview
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Long-wave filter is called in the digital photography industry, and its optical characteristics are same, that is, the light in the long-wave direction is highly transmitted, while the light in the relatively short-wave direction is cut off. It belongs to a type of cut-off filter. Of course, the long-wave filter used in optical precision instruments, its cut-off filter. Depth is more demanding than photographic filters, and its quality is higher. The long-wave filter is made of special colored glass, and the dopant in the material absorbs the spectrum of a specific band but transmits the long-wave band. These filters are absorbing filters and are not suitable for use under laser conditions.
Product Specifications
- Process: Ion Assisted Dura
- Wavelength (nm): LP320, 420, 435, 455, 475, 495, 510, 530, 550, 570, 590, 610, 630, 665, 695, etc
- Average Transmittance: >90%
- Steepness: 50%～OD5 < 10nm
- Cutoff Depth: OD>6
- Size (mm): Φ25.4, 70×70
Application Areas
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Long-pass filters are mainly used in biometric identification, optical fiber lighting, strong light flashlights, medical testing instruments, beauty photonic equipment, multi-band detectors, stage lighting systems, cold light source display cabinets, digital imaging applications and other fields and industries.
| Parameter | Specification |
|---|---|
| Process | IAD Hard Coating |
| Wavelength | LP320, 420, 435, 455, 475, 495, 510, 530, 550, 570, 590, 610, 630, 665, 695, etc |
| T avg. | >90% |
| Slope | 50%～OD5 < 10nm |
| Blocking | OD>6 |
| Size | Φ25.4, 70×70 |
Spectrum
Production Process
Frequently Asked Questions
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What is a long-pass filter and how does it work?
A long-pass filter (LP filter) is an optical filter that transmits light with wavelengths longer than a specific cutoff wavelength while blocking shorter wavelengths. It works by using specially formulated colored glass where dopant materials absorb specific short-wave bands while allowing long-wave light to pass through freely.
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What coating process is used for these long-pass filters?
These long-pass filters utilize IAD (Ion Assisted Deposition) Hard Coating technology, also referred to as Ion Assisted Dura coating. This advanced process produces highly durable, scratch-resistant coatings with excellent optical performance and environmental stability.
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What wavelength options are available for these long-pass filters?
A wide range of wavelength options are available, including LP320, 420, 435, 455, 475, 495, 510, 530, 550, 570, 590, 610, 630, 665, and 695 nm, among others. Custom wavelength specifications can also be accommodated for special applications.
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Are these long-pass filters suitable for use with laser systems?
No. These long-pass filters are absorbing filters made from special colored glass. Because they absorb rather than reflect unwanted wavelengths, they are not recommended for use under laser conditions, as high-intensity laser light may cause damage to the filter material.
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What are the typical application fields for long-pass filters?
Long-pass filters are widely used across many industries including biometric identification, optical fiber lighting, strong light flashlights, medical testing instruments, beauty photonic equipment, multi-band detectors, stage lighting systems, cold light source display cabinets, and digital imaging applications.
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What are the standard sizes and key performance parameters of these filters?
Standard sizes available are Φ25.4 mm (round) and 70×70 mm (square). Key performance parameters include an average transmittance of >90%, a steep transition slope of 50%～OD5 in less than 10nm, and a blocking depth of OD>6, ensuring excellent spectral precision and efficiency.