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Narrow Band Pass Interference Filters from China Suppliers - High Precision Factory Solutions for Ultraviolet to Infrared Applications
🔬 Product Overview
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Narrowband filters can selectively pass a specific wavelength of light, with a passband generally less than 5% of the central wavelength value.
Narrowband filters can selectively pass a specific wavelength of light. The narrow-band filter is subdivided from the band-pass filter, the definition is the same as that of the band-pass filter, the filter allows the optical signal to pass in a specific wavelength band, and deviates from the two wavelengths outside this band. The side light signal is blocked, and the passband of the narrowband filter is relatively narrow, generally less than 5% of the central wavelength value. The main technical parameters of narrow-band filters include center wavelength, half bandwidth, cut-off range and cut-off depth.
📋 Product Specifications
The narrow-band filters produced by Bodian use corresponding appropriate process parameters in different wavelength ranges. In the ultraviolet wavelength region, the induced transmission filter process is usually used to make narrow-band filters; in the visible and near-infrared wavelengths, ion-assisted filters are used. The narrow-band filter is made by the coating process; the narrow-band filter is made by the thermal evaporation process in the mid-far infrared wavelength region. Please specify the required narrowband filter product specifications when selecting. The narrow-band filters provided by Bodian usually use D263T or fused silica as the base material. Specifications such as size and thickness can be adjusted according to user needs.
🎯 Application Areas
Narrow-band filters are used in biochemical analyzers, microplate readers, fluorescence analyzers, cable TV upgrade equipment, wireless transmission equipment, mobile phone barcode scanning, infrared electronic whiteboards, infrared cameras, infrared touch screens, iris recognition, infrared medical instruments, infrared ink recognition, red film recognition, face recognition sensor systems, handheld infrared laser rangefinders, laser rangefinders, optical instruments, medical and health equipment and testing instruments, with a wide range of applications.
| Process | IAD Hard Coating |
| Wavelength Range | 200～2300nm |
| CWL | 220, 254, 275, 280, 340, 365, 405, 450, 492, 546, 578, 630, 808, 850, 1064, 1572, etc. Refer to Appendix |
| T peak | 15%～90% |
| Blocking | OD4~OD6 @ 200～1200nm |
| Dimension | Φ10, Φ12, Φ12.7, Φ15, Φ25, Φ50, etc. |
| Application | Biochemical Analyzer, Fluorescence Analyzer Laser system and other optical systems |
📈 Spectrum
Dielectric Narrow Band Pass Interference Filters
Dielectric Narrow Band Pass Interference Filters
UV Induced Narrow Band Pass Interference Filters
UV Induced Narrow Band Pass Interference Filters
⚙ Production Process
❓ Frequently Asked Questions
Q
What is a narrowband filter and how does it differ from a standard bandpass filter?
A narrowband filter is a specialized type of bandpass filter that allows only a very specific range of wavelengths to pass through. While both filter types block light outside a defined wavelength band, the key distinction is the passband width — narrowband filters have a passband that is generally less than 5% of the central wavelength value, making them far more selective than standard bandpass filters.
Q
What wavelength range do Bodian's narrowband filters cover?
Bodian's narrowband filters cover a broad wavelength range from 200nm to 2300nm, spanning ultraviolet (UV), visible, near-infrared (NIR), and mid-far infrared regions. Common center wavelengths (CWL) include 220, 254, 365, 405, 450, 630, 808, 850, 1064, 1572nm and many others.
Q
What manufacturing processes are used to produce narrowband filters at different wavelength ranges?
Bodian uses different manufacturing processes depending on the wavelength range: the induced transmission filter process is used for the ultraviolet region; ion-assisted deposition (IAD) hard coating is used for visible and near-infrared wavelengths; and thermal evaporation coating is used for mid-far infrared wavelength regions. This ensures optimal optical performance across all wavelength bands.
Q
What substrate materials are used in Bodian narrowband filters?
Bodian narrowband filters typically use D263T glass or fused silica as the base substrate material. Both materials offer excellent optical clarity and stability. Custom sizes and thicknesses are also available and can be adjusted according to specific user requirements.
Q
What are the main technical parameters to consider when selecting a narrowband filter?
The main technical parameters to consider when selecting a narrowband filter include: Center Wavelength (CWL), Half Bandwidth (FWHM), Cut-off Range, and Cut-off Depth (blocking level). For Bodian filters, the peak transmittance (T peak) ranges from 15% to 90%, and blocking performance reaches OD4 to OD6 across the 200–1200nm range.
Q
In which industries and applications are narrowband filters commonly used?
Narrowband filters are widely used across many industries and applications, including biochemical analyzers, microplate readers, fluorescence analyzers, infrared cameras, infrared touch screens, iris and face recognition systems, laser rangefinders, cable TV and wireless transmission equipment, mobile barcode scanning, infrared medical instruments, and various optical and testing instruments.