Narrow band infrared filters with broad field of view

Thomas D. Rahmlow, Jr.; Jeanne E. Lazo-Wasem; Edward J. Gratrix

doi:10.1117/12.683972

18 May 2006 Narrow band infrared filters with broad field of view

Thomas D. Rahmlow, Jr., Jeanne E. Lazo-Wasem, Edward J. Gratrix

Proceedings Volume 6206, Infrared Technology and Applications XXXII; 62062S (2006) https://doi.org/10.1117/12.683972
Event: Defense and Security Symposium, 2006, Orlando (Kissimmee), Florida, United States

Abstract

Optical interference notch filters shift to shorter wavelengths with increasing angles of incidence. This phenomenon restricts the filter's field of view and limits the practical application of narrow reflection notch filters. The amount of shift is inversely proportional to the effective average index of the composite film. A method of designing narrow notch optical filters with very broad field of view and controllable bandwidth is demonstrated. Because this method produces a filter that is predominantly composed of the high refractive index material, it will shift on angle less than a typical quarter-wave notch filter. Increasing the effective index of the filter also reduces the separation of S and P-polarized light with angle. This paper presents modeled and measured performance for both mid and far-infrared filters developed using this technique. Narrow notch discrete and rugate filter designs are compared.

Citation Download Citation

Thomas D. Rahmlow, Jr., Jeanne E. Lazo-Wasem, and Edward J. Gratrix "Narrow band infrared filters with broad field of view", Proc. SPIE 6206, Infrared Technology and Applications XXXII, 62062S (18 May 2006); https://doi.org/10.1117/12.683972

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