Delta Optical Thin Film

Delta Optical Thin Film

Delta Optical Thin Film A/S is a Denmark-based manufacturer specializing in custom optical filters and thin film coatings for OEM instrument makers worldwide. Since the 1970s, Delta has been a pioneer in optical thin film coating technology, partnering with customers to design filters engineered to exact spectral, mechanical, and budget specifications — from prototype quantities through full volume production.

Our product range covers the UV-A, visible, and NIR spectrum (approx. 300–1700 nm), including homogeneous bandpass, multi-bandpass, edge, notch, and blocking filters, as well as dichroic, AOI-tolerant, and polarization beamsplitters (including beamsplitter cubes). We also manufacture linear variable filters — bandpass, edge, beamsplitter, order-sorting, and complete filter sets — ideal for fluorescence spectroscopy, hyperspectral imaging, microscopy, and other demanding analytical instruments.

Backed by proprietary design and deposition-control software, Delta Optical Thin Film delivers fast, precise, and repeatable custom filter solutions tailored to each OEM's performance, timeline, and price requirements. Based just north of Copenhagen, we serve instrument developers and OEM manufacturers globally with the flexibility and technical depth of an owner-run specialist.

Product Warranty Information

a. Delta Optical Thin Film undertakes to make good any defects in the product caused by faulty design, materials or workmanship.

b. This guarantee is limited to defects arising or revealed within 12 months of the time of delivery.

c. Supplies are not included in this guarantee.

d. If purchased components are used, the guarantee period for such components matches the guarantee period Delta Optical Thin Film obtained from its own suppliers.

e. In case of complaints, the customer must send Delta Optical Thin Film a written description of the defects without delay. After receiving a complaint, provided the defect falls within the scope of these provisions, Delta Optical Thin Film shall — at its discretion — be entitled to:
i. repair the defective part or equipment on location, or
ii. have the defective part or equipment returned to Delta Optical Thin Film for repair, or
iii. replace the defective part or equipment, or
iv. replace the defective part or equipment with the effect that the customer can have the equipment repaired for Delta Optical Thin Film's account.

f. If defective parts or equipment are returned to Delta Optical Thin Film for replacement or repairs, the costs and risk of transport shall be borne by the customer.

g. Defective parts or equipment replaced under these terms and conditions shall be placed at Delta Optical Thin Film's disposal.

h. Delta Optical Thin Film's liability is limited to defects or faults arising during correct use. Delta Optical Thin Film shall not be liable for defects or faults caused by or resulting from:

  • incorrect installation, maintenance, or repairs carried out by persons other than Delta Optical Thin Film personnel or its agent, or
  • modifications made without Delta Optical Thin Film's written approval.
    Delta Optical Thin Film shall not be liable for defects or faults caused by normal wear and tear.

i. The guarantee period for spare parts and accessories shall be the same as for replaced parts.

Return Policy

a. Products that are returned in accordance with section 2 (product guarantee) or for other reasons must be accompanied by an RMA number issued by Delta Optical Thin Film. Returns without an RMA number are not accepted.

b. Every returned product must be marked with the company's lot number and product number (LF number).

c. The customer is obliged to inspect products for visual defects within two months after delivery and must immediately notify Delta Optical Thin Film in case of defects that are outside of agreed specifications.

d. Products that have been used, assembled or glued into the customer's products, or in any other way processed (except for inspection), are excluded from returns.