Dual Bandpass Optical Filter
A dual bandpass optical filter transmits two separately specified wavelength bands while blocking wavelengths outside both passbands. Chenyu Optics reviews the center wavelength, FWHM, required peak transmission, complete blocking range, optical density and angle of incidence for each custom design because achievable performance depends on wavelength, substrate, filter size and coating design.
Dual Bandpass Optical Filter Overview
Dual bandpass optical filters combine two independently specified transmission bands in one optical filter.
Each passband requires its own center wavelength, FWHM and peak transmission requirement. The blocking wavelength range and optical density must cover the wavelengths between the two passbands and the required regions on both sides.
Chenyu Optics supports custom dual bandpass filter manufacturing according to customer drawings, including custom substrate material, dimensions, center wavelength and bandwidth for each individual band for prototype and repeat production.
Key Advantages of Dual Bandpass Filter
Multi-Wavelength Fluorescence & Machine Vision Systems
Dual bandpass filters are widely used for simultaneous two-wavelength detection in fluorescence imaging systems, dual-wavelength laser setups and machine vision applications.
Dual Bandpass Optical Filter Specifications
| Parameter | Band 1 | Band 2 |
|---|---|---|
| Center Wavelength | According to customer requirements | According to customer requirements |
| FWHM | According to customer requirements | According to customer requirements |
| Peak Transmission | Subject to technical confirmation | Subject to technical confirmation |
| Blocking Range | Specified between the two passbands and on both outer sides | Specified between the two passbands and on both outer sides |
| Optical Density | Subject to technical confirmation | Subject to technical confirmation |
Spectral Transmission Curve (Typical)
Why Choose Chenyu Optics for Dual Bandpass Filter
Chenyu Optics focuses on drawing-based precision filter manufacturing for fluorescence, laser, and machine vision systems. We support prototype verification, small-batch production and repeat manufacturing for non-standard dual bandpass filters.
Manufacturing Capability for Dual Bandpass Filter
Precision Polishing
Surface and dimensional requirements are processed according to the approved drawing and inspection criteria.
Dielectric Coating Design
Coating requirements are reviewed according to both center wavelengths, bandwidths, transmission targets, blocking range and angle of incidence.
Inspection & Packaging
Spectral and dimensional inspection follows the agreed requirements and available measurement range, followed by protective packaging.
Custom Dual Bandpass Filter Options
Bandpass Filter Type Comparison
| Filter Type | Typical FWHM | Peak Transmission | Blocking (OD) | Typical Applications |
|---|---|---|---|---|
| Dual Bandpass Filter | Specified independently for each band | Subject to technical confirmation per band | Subject to technical confirmation | Multi-wavelength fluorescence, dual-laser systems |
| Narrow Bandpass Filter | Custom specification available upon request | Depends on wavelength and coating design | Defined by required blocking range | Laser line selection, fluorescence |
| Standard Bandpass Filter | Custom specification available upon request | Depends on wavelength and coating design | Defined by required blocking range | Machine vision, instrumentation |
| Wide Bandpass Filter | Custom specification available upon request | Depends on wavelength and coating design | Defined by required blocking range | Imaging, spectroscopy |
Applications of Dual Bandpass Filter
Multi-Wavelength Fluorescence Imaging
Simultaneous detection of two fluorophores in a single filter.
Dual-Wavelength Laser Systems
Selective transmission of two independent laser lines.
Machine Vision Systems
Multi-band spectral control for industrial inspection.
Multiplexed Spectroscopy
Simultaneous measurement across two spectral bands.
Optical Communication Systems
Dual-channel wavelength selection for communication links.
Scientific Research Equipment
Precision dual-band filtering for research instruments.
Dual Bandpass Filter FAQ
What is the function of a dual bandpass filter?
A dual bandpass optical filter transmits two separately specified wavelength bands while blocking wavelengths outside both passbands.
Can the two passbands be positioned independently?
Yes. Each passband's center wavelength and bandwidth can be independently customized according to application requirements.
What are common uses of dual bandpass filters?
They are commonly used in multi-wavelength fluorescence imaging, dual-wavelength laser systems, and multiplexed spectroscopy.
Can dual bandpass filters be customized?
Yes. Custom center wavelengths, bandwidths, substrate materials, dimensions, and blocking ranges are available.
What information should I provide for a quotation?
Please provide both center wavelengths, both FWHM bandwidths, required transmission for each passband, the complete blocking range, optical density requirement, angle of incidence, filter dimensions and quantity.
Where can I learn more about bandpass filter design?
Additional information on bandpass filter design can be found from Edmund Optics.
Related Products for Dual Bandpass Filter
Request a Custom Dual Bandpass Optical Filter Quote
Please provide both center wavelengths, both FWHM bandwidths, the required peak transmission for each passband, the complete blocking range, optical density requirement, angle of incidence, filter dimensions and quantity. These details are required to review the coating design and achievable performance.