Colour filters are optical components that transmit a selected band of visible (or near-visible) wavelengths and reject the rest. They are made by dyeing or coating optical glass, fused silica or crystal substrates, so their behaviour depends as much on the glass chemistry as on the thin-film or dichroic coating. Band-pass, long-pass, short-pass and neutral-density filters, and colour-glass and dichroic variants, all come out of the same process. This page collects every Jingyu Optics guide on the subject — 33 articles covering specification, selection, cost, quality, comparison and troubleshooting — so that an engineer can find the relevant note without searching.
How a colour filter is specified
The parameters below come up in every one of the guides, and each changes what a coating house or glass supplier has to do. They are the fastest way to describe a part in an enquiry.
- Central wavelength (CWL) and pass-band width (FWHM): the band the part must transmit, and how wide it is.
- Transmission in band and blocking outside it (cut-off range and optical density): most colour filters fail on rejection, not on transmission.
- Edge steepness: how quickly transmission falls from pass band to blocking band, which decides how many coating layers are needed and whether a dichroic design is required.
- Substrate and thickness: optical colour glass, fused silica, borosilicate or crystal substrate, and the thickness the mount and the wavefront budget allow.
- Angle of incidence: a coated colour filter shifts to shorter wavelengths as the incidence angle grows, so the working geometry belongs in the specification.
- Environment: operating temperature range, humidity, abrasion and cleaning regime decide whether a hard coat and an environmental test are required.
- Mechanical tolerances: outside dimensions, thickness tolerance, chamfer, edge quality and surface quality grade.
All 33 Colour filter guides
Specification guides
Selecting a process or part for an application
What drives cost and lead time
Inspection, standards and traceability
Failure modes and practical fixes
Colour filters vs the alternatives
Design trends and sourcing notes
Manufacturing and supply
Jingyu Optics Co., Ltd. is an optical component manufacturer in Zhuji, Zhejiang, China. The company supplies optical glass and fused silica substrates, custom multi-layer thin-film coatings and precision cold-fabricated glass components to OEM/ODM customers. The catalogue covers 426 products across three groups: coatings (255), materials (135) and fabrication (36).
Over 3,000 m² own plant, Class 1000 cleanroom, nearly 20 coating chambers, laser cutting machines, ultrasonic cleaning lines and spectrometric inspection systems; one-stop chain of substrate cold processing → multi-layer coating → ultrasonic cleaning → 100% final inspection.
Ordering: Sample lead time: 1–2 days for coated stock optics, and about 3 days for custom-coated parts, subject to coating design complexity. In-stock products ship within 1–2 days. Custom fabrication orders take approximately 5–7 days. Our team starts processing right after receiving your order. We can provide quotations and arrange expedited production if you have a required lead time. MOQ depends on the product. We are flexible: small-batch and trial orders are welcome for new projects, and we scale up to mass production once the design is validated. T/T bank transfer and major international payment methods. Shipping terms include EXW, FOB, CIF; by sea, air or express courier as you prefer. An engineer (not a robot) replies within 24 hours with a quotation and lead time. Enquiries go to the contact form or xiao@gobofactory.com.
Markets served: Europe, North America, Russia & CIS, Australia and New Zealand, South America, the Middle East, and China (mainland, Hong Kong, Macau and Taiwan).