By Delta Optical Thin Film A/S
Get inspired by the products we have already made - or let us design your custom Bandpass Filter Most of our products are custom designed filters and the examples we show on this webpage are just for inspiration. We often find benefits for our customers in a custom designed solution. Can I order a filter with a centre wavelength or bandwidth not listed in your product table? Yes — the vast majority of filters Delta Optical Thin Film delivers are custom-designed. The products shown on the website are examples for inspiration only. If your application requires a specific centre wavelength, bandwidth, transmission level, or physical size not found in the standard range, please contact us to discuss your requirements. We manufacture custom filters using either Plasma Assisted Evaporation Technology or Magnetron Sputtering Technology, depending on the specifications needed. What factors drive up the cost of a custom bandpass filter? The main cost drivers are over-specification of blocking level and blocking range. Demanding very deep blocking — such as OD6 or better — across a wide wavelength range requires a significantly higher number of coating layers, which increases both production time and complexity. Deep blocking levels are also slow and demanding to verify on a spectrophotometer, adding to overall cost. At Delta Optical Thin Film, we always engage in a thorough discussion with customers before finalising specifications, to ensure the filter is optimised for the actual application without unnecessary cost.
