Deposition Sciences releases highly durable LWIR bandpass filters

April 23, 2010
Longwave IR optical filters maintain band edge placement with great precision.


Longwave IR optical filters maintain band edge placement with great precision.

Deposition Sciences, Inc. (DSI; Santa Rosa, CA, USA), manufacturer of highly durable thin film optical coatings, provides long wavelength infrared (LWIR) bandpass filters with superior operation at any temperature between ambient and 10 degrees K. The thin film coatings are manufactured via DSI’s proprietary physical vapor deposition with the ion-assist process, making them highly durable and robust and feature extremely precise band edge placement for critical sensing applications.

DSI’s LWIR bandpass filters are ideal for use in imaging sensor filters, order-sorting filters, thermal and/or night vision tasks, and FLIR optics. A variety of substrates, such as germanium, silicon, zinc sulfide, zinc selenide, quartz, sapphire, and polymers are available for these longwave infrared filters, depending on the customer’s wavelength requirements. Multispectral filters can also be provided when multiple filters are needed on a singe substrate. Various sizes, from a few millimeters to over 2 inches diameter can be provided. Cryogenic operating temperature transmittance measurements, down to 10 K, can be made in-house and customized to filter specifications. Out-of-band transmittance can be designed to OD 6 or greater and measured to OD 4 from 2,000 nm to 50,000 nm, and to OD 5 from 500 nm to 2,000 nm.

The DSI engineering staff is available to develop custom optical filters for specific requirements or for extremely demanding applications. For more information about the highly durable longwave IR filters, please visit

-- Posted by Vision Systems Design

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