Narrow Bandpass Filter
Narrow Bandpass Filters are precision optical filters designed to transmit a specific narrow wavelength range while blocking unwanted wavelengths outside the passband. Using multilayer dielectric coatings, these filters provide high transmission at the target wavelength and high optical density blocking. Chenyu Optics manufactures narrow bandpass filters in BK7 and fused silica with custom center wavelength and bandwidth.
Narrow Bandpass Filter Overview
Narrow Bandpass Filters are precision optical filters designed to transmit a specific narrow wavelength range while blocking unwanted wavelengths on both sides. They are essential components in laser systems, fluorescence imaging, spectroscopy and a wide range of optical instruments.
Using multilayer dielectric coatings, these filters provide high transmission at the target wavelength and high optical density blocking, making them suitable for laser systems, fluorescence imaging, spectroscopy and optical sensing applications.
Chenyu Optics offers a complete range of standard and custom narrow bandpass filters with high transmission, deep blocking and excellent out-of-band performance. Custom center wavelength, bandwidth, optical density, substrate, coating and size are all available.
Key Advantages of Narrow Bandpass Filter
Imaging & Optical Sensing Applications
Narrow bandpass filters are widely used for precise wavelength selection in imaging systems, machine vision, optical sensing equipment and laboratory instrumentation.
Typical Specifications of Narrow Bandpass Filter
| Center Wavelength (CWL) | Custom |
|---|---|
| FWHM Bandwidth | Custom, typically 1–10 nm |
| Peak Transmission | >90% |
| Blocking (Out-of-Band) | OD4 – OD6+ |
| Substrate Material | BK7 / Fused Silica |
| Coating | Dielectric bandpass coating |
| Surface Quality | High precision optical finish |
| Size | Custom |
Spectral Transmission Curve (Typical)
Why Choose Chenyu Optics for Narrow Bandpass Filter
Chenyu Optics focuses on drawing-based precision filter manufacturing for laser, fluorescence, spectroscopy and industrial optical systems. We support prototype verification, small-batch production and repeat manufacturing for non-standard narrow bandpass filters.
Manufacturing Capability for Narrow Bandpass Filter
Precision Polishing
High surface quality processing for stable filter performance.
Dielectric Coating
High performance multilayer dielectric coating for narrow-band transmission.
Inspection & Packaging
Strict quality control on center wavelength, bandwidth and blocking, with clean protective packaging before shipment.
Custom Narrow Bandpass Filter Options
Bandpass Filter Type Comparison
| Filter Type | Typical FWHM | Peak Transmission | Blocking (OD) | Typical Applications |
|---|---|---|---|---|
| Narrow Bandpass Filter | 1 – 10 nm | >90% | OD4 – OD6+ | Laser line selection, fluorescence |
| Standard Bandpass Filter | 10 – 50 nm | >90% | OD4 – OD6+ | Machine vision, instrumentation |
| Wide Bandpass Filter | 50 – 200 nm | >90% | OD4 – OD6 | Imaging, spectroscopy |
| Custom Bandpass Filter | Custom | >90% | Up to OD6+ | Special systems, OEM projects |
Applications of Narrow Bandpass Filter
Laser Optical Systems
Precise wavelength selection for laser system beam paths.
Fluorescence Imaging Systems
Wavelength isolation for fluorescence excitation and emission.
Spectroscopy Instruments
Narrow-band spectral selection for measurement systems.
Machine Vision Systems
Wavelength filtering for machine vision and inspection equipment.
Optical Sensing Equipment
Precision spectral filtering for optical sensor design.
Raman Analysis Systems
Narrow-band filtering for Raman spectroscopy setups.
Narrow Bandpass Filter FAQ
What is a narrow bandpass filter used for?
A narrow bandpass filter transmits a specific wavelength range while blocking unwanted spectral components.
What parameters define a narrow bandpass filter?
The main parameters include center wavelength, bandwidth (FWHM), peak transmission, and optical density blocking.
Can the center wavelength be customized?
Yes. Custom center wavelengths and bandwidths are available according to application requirements.
Does incident angle affect filter performance?
Yes. The center wavelength may shift with incident angle, so coating design should match the optical system configuration.
What information should I provide for a quotation?
Please provide center wavelength, bandwidth, substrate material, dimensions, angle of incidence, quantity and drawing if available.
Where can I learn more about bandpass filter design?
Additional information on bandpass filter design can be found from Edmund Optics.
Related Products for Narrow Bandpass Filter
Need Custom Narrow Bandpass Filters?
Send us your center wavelength, bandwidth, substrate, dimensions, coating requirements and quantity. Chenyu Optics will review the optical and mechanical specifications and provide a suitable narrow bandpass filter manufacturing suggestion.