Excitation Filter
Excitation Filters are precision optical filters designed to transmit specific excitation wavelengths while blocking unwanted surrounding wavelengths. Using advanced dielectric coating technology, excitation filters provide high transmission within the target excitation band and high optical density blocking outside the passband. Chenyu Optics manufactures excitation filters in optical glass and fused silica with custom center wavelengths, bandwidths and coating options for fluorescence imaging and optical analysis systems.
Excitation Filter Overview
Excitation Filters are precision optical filters designed to transmit specific excitation wavelengths while blocking unwanted wavelengths outside the target spectral range.
Using advanced dielectric coating technology, excitation filters provide high transmission within the excitation band and high optical density blocking outside the passband. They are widely used in fluorescence imaging, microscopy, Raman spectroscopy, optical sensing and analytical instrument systems.
Chenyu Optics supports custom excitation filter manufacturing according to customer drawings, including custom substrate materials, dimensions, center wavelengths, bandwidths and coating designs for prototype and repeat production.
Key Advantages of Excitation Filter
Fluorescence Imaging & Microscopy Systems
Excitation filters are widely used for precise excitation wavelength selection in fluorescence imaging systems, microscopy equipment, Raman spectroscopy and analytical instruments.
Typical Specifications of Excitation Filter
| Material Options | Optical Glass, BK7, Fused Silica |
|---|---|
| Coating Type | Dielectric bandpass coating |
| Optical Function | Excitation wavelength selection |
| Center Wavelength | Customizable |
| Bandwidth (FWHM) | Customizable |
| Transmission | High transmission within excitation band |
| Blocking | High optical density outside passband |
| Surface Quality | High precision optical finish |
Spectral Transmission Curve (Typical)
Why Choose Chenyu Optics for Excitation Filter
Chenyu Optics focuses on drawing-based precision filter manufacturing for fluorescence imaging, microscopy, spectroscopy and analytical instrument systems. We support prototype verification, small-batch production and repeat manufacturing for non-standard excitation filters.
Manufacturing Capability for Excitation Filter
Precision Polishing
High surface quality processing for stable filter performance.
Dielectric Coating
High performance dielectric bandpass coating for precise excitation wavelength and bandwidth control.
Inspection & Packaging
Strict quality control on center wavelength, bandwidth and blocking, with clean protective packaging before shipment.
Custom Excitation Filter Options
Fluorescence Filter Set Comparison
| Filter Type | Typical FWHM | Peak Transmission | Blocking (OD) | Role in Filter Set |
|---|---|---|---|---|
| Excitation Filter | 10 – 40 nm | >90% | OD4 – OD6+ | Selects light source excitation wavelength |
| Emission Filter | 10 – 50 nm | >90% | OD4 – OD6+ | Isolates fluorescence emission signal |
| Dichroic Filter | N/A (edge-based) | >90% | OD4 – OD6+ | Separates excitation and emission paths |
| Bandpass Filter | 10 – 50 nm | >90% | OD4 – OD6+ | General-purpose wavelength selection |
Applications of Excitation Filter
Fluorescence Imaging Systems
Excitation wavelength selection for fluorescence imaging light sources.
Microscopy Equipment
Precise excitation band control for fluorescence microscopy systems.
Raman Spectroscopy Equipment
Excitation wavelength filtering for Raman spectroscopy setups.
Optical Sensing Systems
Precision spectral filtering for optical sensor light sources.
Analytical Instruments
Excitation band selection for analytical and diagnostic instruments.
Light Source Filtering
Spectral shaping of illumination sources in optical systems.
Excitation Filter FAQ
What is an excitation filter used for?
An excitation filter transmits a selected excitation wavelength while blocking unwanted background light before it reaches the sample.
What parameters define an excitation filter?
Key parameters include center wavelength, bandwidth (FWHM), peak transmission, optical density blocking, and incident angle.
How does an excitation filter differ from an emission filter?
An excitation filter shapes the illumination light before the sample, while an emission filter isolates the fluorescence signal returning from the sample.
Can excitation filters be customized for different wavelengths?
Yes. Filters can be customized for UV, visible, and near-infrared excitation wavelengths.
Does incident angle affect excitation 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 excitation filter design?
Additional information on excitation filter design can be found from Edmund Optics.
Related Products for Excitation Filter
Need Custom Excitation 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 excitation filter manufacturing suggestion.