Dichroic Filters

Name: Dichroic Filters
Brand: PhotonEdge
SKU: PE-FILTER-DICHROIC-033
Availability: LimitedAvailability

Key Specifications

Type	Dichroic (Multiband)
Design	Custom wavelength separation
Transmission	> 90% in passband
Reflection	> 95% in stopband
Transition Width	10-50nm typical
Substrate	BK7 / UV Fused Silica
Diameter	6-100 mm
AOI	0° / 45° / Custom

What Is a Dichroic Filters?

Dichroic Filters are precision optical filters designed for fluorescence microscopy (excitation/emission separation). They use thin-film interference to selectively transmit or block specific wavelength bands.

PhotonEdge designs custom filter coatings optimized for your specific wavelength requirements and application environment.

When Should You Use This Product?

✔ Good Choice When

✓ Fluorescence microscopy (excitation/emission separation)
✓ Multi-band imaging systems
✓ Laser wavelength combining/separation
✓ Spectral analysis and separation

⚠ Consider an Alternative When

✗ Single wavelength isolation → Narrow Band Filter

✗ Simple edge filtering → Longpass/Shortpass Filter

✗ Beam splitting (not wavelength) → Cube Beamsplitter

✗ Attenuation → Neutral Density Filter

Available Optical Materials

Select the optimal substrate material based on your wavelength, environment, and budget requirements.

Material	Transmission	Key Advantage	Considerations
BK7	VIS / NIR (350-2000nm)	Low cost, good for visible applications	Not suitable for UV < 350nm
UV Fused Silica	UV / VIS / NIR (185-2100nm)	Required for UV center wavelengths	Higher cost than BK7
Borosilicate (B270)	VIS (400-700nm)	Economy choice for visible-only	Limited wavelength range

Not sure which material to choose?

Ask AI Optical Engineer

Optical Coating Options

Hard Dielectric

High stability, multi-layer design.

Typical use: Laser and demanding environments

Custom Design

Engineered for specific wavelength pairs.

Typical use: Fluorescence and multi-band systems

How to Specify Your Coating

To select the right coating, please provide: (1) Operating wavelength, (2) Angle of incidence, (3) Required transmission or reflectivity, (4) Laser power density (if applicable), (5) Operating environment.

Engineering Considerations

Key factors to evaluate when specifying this optical component for your system.

Center Wavelength / Cut-off

Specify your target wavelength. For filters at non-normal incidence, account for AOI-induced wavelength shift.

Bandwidth / Edge Steepness

Narrower bandwidth or steeper edges increase cost. Specify the minimum performance required.

Blocking (OD)

Higher OD provides better out-of-band rejection but may reduce peak transmission.

AOI Effects

Increasing AOI shifts transmission curves toward shorter wavelengths. Specify your beam geometry for accurate performance.

Applications

Spectroscopy

Beam conditioning, wavelength selection, and signal extraction in spectrometers.

Laser Systems

Laser line filtering, beam shaping, and optical filtering.

Fluorescence & Bioimaging

Excitation and emission filtering for fluorescence microscopy.

Research & Education

Optical measurement setups and spectroscopic analysis.

Manufacturing & Customization

PhotonEdge supports optical component sourcing, engineering review, and qualified manufacturing through our optical manufacturing network. We coordinate production, coating, and inspection to deliver components that meet your specifications.

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Prototype

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Low Volume

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Volume Production

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Custom Specification

Quality Assurance

Dimensional Inspection

Diameter, thickness, focal length verified per specification

Surface Quality

Scratch-dig inspection under calibrated illumination

Coating Verification

Spectrophotometric measurement of transmission/reflectance

Inspection documentation available according to project requirements. Certificates of Conformance, material test reports, and coating curves can be provided.

You May Also Need

Related Knowledge

Engineering Documentation

The following documentation is available upon request for qualified engineering projects:

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Dimensional Drawing

CAD & dimensional specs per your requirements

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Material Data Sheet

Material properties, transmission curves & certificates

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Coating Performance Curve

Spectrophotometric measurement data

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Inspection Report

Surface quality, flatness, centration & dimensional data

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Certificate of Conformance

CoC with full traceability per project requirements

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Custom Specification Sheet

Application-specific specification documentation

Documentation availability depends on project scope and order quantity. Request details during RFQ.

Frequently Asked Questions

Can I specify custom wavelengths?

Yes. We design custom filters for any center wavelength from 200nm to 2500nm. Provide your target specifications for a custom design.

How does angle of incidence affect filter performance?

For bandpass filters, increasing AOI shifts the center wavelength toward shorter wavelengths (blue shift). Always specify your beam geometry.

What does OD 4 blocking mean?

OD 4 means the filter blocks 99.99% of out-of-band light (transmission < 0.01%). Higher OD provides better blocking but may reduce peak transmission.

What substrate should I choose?

BK7 for visible, UV Fused Silica for UV wavelengths, Borosilicate for economy visible-only applications.

Can these filters handle high-power laser?

Hard dielectric coatings handle moderate to high powers. Specify laser power density for proper coating selection.

What is the typical lead time?

Standard filters ship within 1-2 weeks. Custom designs require 3-4 weeks.

What is a dichroic filter?

A dichroic filter reflects certain wavelengths while transmitting others, enabling wavelength separation in fluorescence and multi-band systems.

Can I specify custom wavelength pairs?

Yes. Provide your excitation and emission wavelengths for custom dichroic design.

Not Sure Which Specification You Need?

Describe your optical system and our AI Optical Engineer will help identify the right specifications, materials, and coatings for your application.

Analyze My Requirement

Request an Engineering Quote

Provide your requirements and our engineering team will respond within 24 hours with a detailed quotation.

TypeDesignTransmissionReflectionTransition WidthSubstrateDiameterAOI

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