Bandpass Filter
Bandpass Filters are precision optical filters designed to transmit a specific wavelength range while blocking surrounding wavelengths. Using advanced dielectric coating technology, bandpass filters provide high transmission within the target passband and high optical density blocking outside the transmission range. Chenyu Optics manufactures bandpass filters in optical glass and fused silica with custom center wavelength, bandwidth and coating options.
Bandpass Filter Overview
Bandpass Filters are precision optical filters designed to transmit a specific wavelength band while blocking unwanted wavelengths outside the passband.
Using advanced dielectric coating technology, bandpass filters provide high transmission within the target spectral range and high optical density blocking outside the passband. They are widely used in fluorescence imaging, Raman spectroscopy, machine vision, optical sensing and laser measurement systems.
Chenyu Optics supports custom bandpass filter manufacturing according to customer drawings, including custom substrate materials, dimensions, center wavelength, bandwidth and coating designs for prototype and repeat production.
Key Advantages of Bandpass Filter
Fluorescence Imaging & Raman Spectroscopy Systems
Bandpass filters are widely used for precise spectral wavelength selection in fluorescence imaging systems, Raman spectroscopy equipment, machine vision and optical sensing systems.
Typical Specifications of Bandpass Filter
| Material Options | Optical Glass, BK7, Fused Silica |
|---|---|
| Coating Type | Dielectric bandpass coating |
| Optical Function | Spectral wavelength selection |
| Center Wavelength | Customizable |
| Bandwidth (FWHM) | Customizable |
| Transmission | High transmission within target passband |
| Blocking | High optical density outside passband |
| Surface Quality | High precision optical finish |
Spectral Transmission Curve (Typical)
Why Choose Chenyu Optics for Bandpass Filter
Chenyu Optics focuses on drawing-based precision filter manufacturing for fluorescence imaging, spectroscopy, machine vision and industrial optical systems. We support prototype verification, small-batch production and repeat manufacturing for non-standard bandpass filters.
Manufacturing Capability for Bandpass Filter
Precision Polishing
High surface quality processing for stable filter performance.
Dielectric Coating
High performance dielectric bandpass coating for precise center wavelength and bandwidth control.
Inspection & Packaging
Strict quality control on center wavelength, bandwidth and blocking, with clean protective packaging before shipment.
Custom Bandpass Filter Options
Bandpass Filter Type Comparison
| Filter Type | Typical FWHM | Peak Transmission | Blocking (OD) | Typical Applications |
|---|---|---|---|---|
| Laser Line Filter | < 1 – 5 nm | >90% | OD4 – OD6+ | Laser measurement, Raman spectroscopy |
| 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 Bandpass Filter
Fluorescence Imaging Systems
Wavelength isolation for fluorescence excitation and emission.
Raman Spectroscopy Equipment
Spectral band filtering for Raman spectroscopy setups.
Machine Vision Systems
Wavelength filtering for machine vision and inspection equipment.
Optical Sensing Systems
Precision spectral filtering for optical sensor design.
Laser Measurement Systems
Selected wavelength band isolation for measurement instruments.
Spectral Analysis Instruments
Precise band selection for spectral analysis and instrumentation.
Bandpass Filter FAQ
What is a bandpass filter used for?
A bandpass filter transmits a selected wavelength band while blocking unwanted light outside that range.
What parameters define a bandpass filter?
Key parameters include center wavelength, bandwidth (FWHM), peak transmission, optical density blocking, and incident angle.
Can bandpass filters be customized for different wavelength bands?
Yes. Filters can be customized for UV, visible, and near-infrared wavelength bands.
Does incident angle affect bandpass filter performance?
Yes. The center wavelength can shift with incident angle, so coating design should match the optical setup.
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 Bandpass Filter
Need Custom 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 bandpass filter manufacturing suggestion.