Dichroic Filter
Dichroic Filters use multilayer dielectric coatings to transmit a customer-specified wavelength band while reflecting a different wavelength band. The transmit band, reflect band, transition edge, angle of incidence and polarization are defined together for the optical system. Chenyu Optics manufactures drawing-defined dichroic filters on optical glass, BK7 and fused silica substrates, with custom dimensions and coating designs subject to technical review.
Dichroic Filter Overview
Dichroic Filters are precision optical filters designed to selectively transmit specific wavelength ranges while reflecting or blocking unwanted spectral regions.
Using advanced dielectric coating technology, dichroic filters provide high transmission in the target wavelength band and efficient spectral separation between transmitted and reflected light. They are widely used in fluorescence imaging, laser systems, optical sensing, microscopy and beam management applications.
Chenyu Optics supports custom dichroic filter manufacturing according to customer drawings, including custom substrate materials, dimensions, wavelength ranges, coating designs and optical specifications for prototype and repeat production.
Available Dichroic Filter Types
Available configurations include longpass dichroic filters, shortpass dichroic filters, wavelength-selective dichroic beamsplitters and custom transmit/reflect filters for fluorescence, laser beam combining, color separation and optical sensing. Final feasibility and spectral performance are confirmed after review of the wavelength bands, AOI, polarization, substrate and dimensions.
Key Advantages of Dichroic Filter
Fluorescence Imaging & Laser Systems
Dichroic filters are widely used for wavelength separation and beam management in fluorescence imaging systems, laser systems, microscopy and optical sensing equipment.
Typical Specifications of Dichroic Filter
| Filter Types | Longpass dichroic, shortpass dichroic, wavelength-selective beamsplitter or custom transmit/reflect design |
|---|---|
| Substrate Materials | Optical glass, BK7 or fused silica; final selection depends on wavelength, thermal and mechanical requirements |
| Coating Type | Multilayer dielectric dichroic coating |
| Optical Function | Transmit one specified spectral band while reflecting another specified band |
| Transmission Band | Customer-specified |
| Reflection Band | Customer-specified |
| Transition / Edge Requirement | Customer-specified; feasibility confirmed by coating design review |
| Dimensions | Drawing-defined |
| Dimensional Tolerance | Drawing-defined; confirmed according to size, geometry and substrate |
| Thickness | Drawing-defined |
| Design Angle of Incidence | Customer-specified; coating performance applies at the agreed AOI |
| Polarization | Customer-specified: random, S, P or defined polarization state |
| Transmission Requirement | Customer-specified over the transmit band at the stated AOI and polarization |
| Reflection Requirement | Customer-specified over the reflect band at the stated AOI and polarization |
| Blocking Requirement | Customer-specified wavelength range and optical density, where required |
| Surface Quality | Drawing-defined and subject to substrate and coating review |
| Spectral Inspection | Transmission and/or reflection measurement under agreed test conditions; report availability confirmed per project |
Spectral Transmission Curve (Typical)
Why Choose Chenyu Optics for Dichroic Filter
Chenyu Optics focuses on drawing-based precision filter manufacturing for fluorescence imaging, laser systems, microscopy and industrial optical systems. We support prototype verification, small-batch production and repeat manufacturing for non-standard dichroic filters.
Manufacturing Capability for Dichroic Filter
Precision Polishing
High surface quality processing for stable filter performance.
Dielectric Coating
High performance dielectric dichroic coating for precise transmission and reflection control.
Inspection & Packaging
Strict quality control on transmission, reflection and blocking, with clean protective packaging before shipment.
Custom Dichroic Filter Options
Spectral Separation Filter Comparison
| Filter Type | Function | Transmission | Reflection | Typical Applications |
|---|---|---|---|---|
| Dichroic Filter | Transmit / reflect separation | Customer-specified; design-dependent | Customer-specified; design-dependent | Fluorescence, laser beam management |
| Bandpass Filter | Wavelength selection | Design-dependent | N/A | Machine vision, instrumentation |
| Edge Filter | Cut-on / cut-off blocking | Design-dependent | N/A | Fluorescence, spectroscopy |
| Beamsplitter | Fixed-ratio splitting | Variable (design-based) | Variable (design-based) | Laser systems, interferometry |
Applications of Dichroic Filter
Fluorescence Imaging Systems
Wavelength separation for fluorescence excitation and emission paths.
Laser Systems
Beam combining and separation in multi-wavelength laser setups.
Microscopy Equipment
Spectral separation for excitation and emission light in microscopy.
Optical Sensing Systems
Wavelength selection and separation for optical sensor design.
Beam Management Systems
Selective transmission and reflection for beam routing applications.
Projection & Display Systems
Color separation and combination for projection and display optics.
Dichroic Filter FAQ
What specifications are needed for a custom dichroic filter?
Please provide the transmission band, reflection band, transition or edge requirement, required transmission and reflection, blocking range and OD if applicable, design AOI, polarization, substrate preference, dimensions, tolerances, surface requirements, operating environment, quantity and drawing.
Can the transmission and reflection bands be customized?
Yes. The transmit and reflect bands can be designed around customer-specified wavelength regions. Feasibility, transition width and achievable performance are confirmed after reviewing the complete spectral specification, substrate, AOI and polarization.
What angle of incidence should be specified?
Specify the actual design angle at which the filter will operate, together with its allowable angular range. Dichroic spectral edges shift with AOI, so performance should not be assumed at a different angle from the approved design condition.
Can you provide measured spectral data?
Transmission and reflection measurements can be discussed for the agreed wavelength range and test conditions. The measurement mode, AOI, polarization, spectral resolution and report format must be confirmed for the project before production.
Which dichroic filter types are available?
Available configurations include longpass, shortpass, wavelength-selective beamsplitter and custom transmit/reflect designs. Final type and coating structure are selected according to the required optical function and system conditions.
Related Products for Dichroic Filter
Need Custom Dichroic Filters?
For quotation, please provide the transmit band, reflect band, transition requirement, required T/R and blocking performance, design AOI, polarization, substrate, dimensions and tolerances, surface requirements, quantity and drawing. Chenyu Optics will review coating feasibility and confirm the applicable inspection conditions before production.