Dichroic Filters
A thin-film filter that reflects one wavelength band and transmits another, used to split or combine light by color at an angle.
Share requirements, quantities and a drawing if available. Specifications and supply terms require confirmation.
Overview
A dichroic filter is a thin-film coated element designed to reflect one wavelength band while transmitting another at a specific angle of incidence (typically 45 degrees), which is what makes it useful for splitting or combining light by wavelength rather than simply blocking part of the spectrum. Fluorescence microscopy cube sets, projection systems and multi-band imaging setups rely on this behavior. Procurement review should center on separating wavelength bands by reflection and transmission at a defined incidence angle.
Key Selection Points
- Reflects one wavelength band and transmits another at an angle, distinct from a straight-through bandpass or longpass filter
- Standard component in fluorescence microscopy cube sets and multi-band imaging/projection systems
Applications
Dichroic filters are used in fluorescence microscopy filter cubes, projection and display systems, and multi-band imaging setups wherever light of different colors needs to be split onto separate paths or combined onto one path.
Spectral Performance
This module explains which spectral variables must be defined before measured performance can be reviewed. For Dichroic Filters, the module focuses on separating wavelength bands by reflection and transmission at a defined incidence angle.
- Review measured performance against supplier or test-lab data tied to the exact configuration.
- Record wavelength region, angle of incidence and polarization with the measurement context.
- Confirm transmission, reflectance and blocking requirements against approved evidence for the selected configuration.
- Product-specific review: connect reflection band with angle of incidence and document the trade-off against a simple bandpass filter.
Prepare a product-specific enquiry
Include the requirements you know and identify any points that need confirmation.
| RFQ input | What to provide |
|---|---|
| Input 1 | System context: explain why Dichroic Filters is being considered for separating wavelength bands by reflection and transmission at a defined incidence angle. |
| Input 2 | Required optical definition: reflection band, then transmission band. |
| Input 3 | Required physical definition: angle of incidence, then polarization and transition edge. |
| Input 4 | Product distinction to record: draw which band follows each path and specify AOI and polarization. |
| Input 5 | Provide the required quantity and program phase. |
| Input 6 | List the applicable drawing, test reference and acceptance basis. |
Frequently Asked Questions
What is the difference between a dichroic filter and a bandpass filter?
A bandpass filter is used straight-through to transmit one band and block the rest; a dichroic filter is used at an angle to reflect one band while transmitting another, splitting the beam into two paths rather than just blocking part of it.
Which specification should be fixed first for Dichroic Filters?
Begin with reflection band. It determines how transmission band and angle of incidence should be evaluated before the mechanical details are finalized.
When is Dichroic Filters a better fit than a simple bandpass filter?
Choose between them by testing the requirement for separating wavelength bands by reflection and transmission at a defined incidence angle. If that requirement is absent, the comparison product may provide a simpler procurement path.
What should an RFQ for Dichroic Filters include?
Draw which band follows each path and specify AOI and polarization. Also include quantity, drawing revision and the required acceptance evidence. Final availability is confirmed during quotation.
Which details for Dichroic Filters still require supplier verification?
Actual material and coating availability, dimensional limits, tolerances, inspection reports, MOQ and lead time cannot be inferred from this page and must be confirmed against the RFQ.
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