Dual Bandpass Filter
Dual Bandpass Filters are precision optical filters designed to transmit two distinct, non-contiguous wavelength bands while blocking all other wavelengths outside those bands. Using multi-cavity dielectric coating technology, dual bandpass filters provide high transmission within each passband and strong out-of-band blocking. Chenyu Optics manufactures dual bandpass filters in BK7 and fused silica with custom center wavelengths and bandwidths for each band.
Dual Bandpass Filter Overview
Dual Bandpass Filters are precision optical filters designed to transmit two distinct, non-contiguous wavelength bands while blocking all other wavelengths outside those bands.
Using multi-cavity dielectric coating technology, dual bandpass filters provide high transmission within each passband and strong out-of-band blocking. They are widely used in multi-wavelength fluorescence imaging, dual-wavelength laser systems, machine vision and multiplexed spectroscopic instruments.
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.
Typical Specifications of Dual Bandpass Filter
| Material Options | BK7, Fused Silica |
|---|---|
| Optical Function | Dual-band spectral transmission |
| Number of Passbands | Two, independently customizable |
| Center Wavelengths | Customizable per band |
| Bandwidth (FWHM) | Customizable per band |
| Peak Transmission | >90% per passband (typical) |
| Blocking Performance | OD4 – OD6+ outside both passbands |
| Surface Quality | 20-10 / 40-20 scratch-dig |
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
High surface quality processing for stable dual-band spectral performance.
Multi-Cavity Dielectric Coating
Advanced multi-cavity coating design to achieve two independent, precisely positioned passbands.
Inspection & Packaging
Strict quality control on both passbands' center wavelength, bandwidth and blocking performance, with clean protective packaging before shipment.
Custom Dual Bandpass Filter Options
Bandpass Filter Type Comparison
| Filter Type | Typical FWHM | Peak Transmission | Blocking (OD) | Typical Applications |
|---|---|---|---|---|
| Dual Bandpass Filter | Independent per band (e.g. 10 – 40 nm each) | >90% per passband | OD4 – OD6+ | Multi-wavelength fluorescence, dual-laser systems |
| 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 |
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 filter transmits two separate, non-contiguous wavelength bands while blocking all other wavelengths.
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 center wavelength and bandwidth for each band, substrate material, dimensions, 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 Dual Bandpass Filter
Need Custom Dual Bandpass Filters?
Send us your center wavelength and bandwidth for each band, substrate, dimensions, and quantity. Chenyu Optics will review the optical and mechanical specifications and provide a suitable dual bandpass filter manufacturing suggestion.