Laser-line rejection or transmission filters based on surface structures built on infrared transmitting materials

Douglas S. Hobbs

doi:10.1117/12.604537

18 May 2005 Laser-line rejection or transmission filters based on surface structures built on infrared transmitting materials

Douglas S. Hobbs

Author Affiliations +

Proceedings Volume 5786, Window and Dome Technologies and Materials IX; (2005) https://doi.org/10.1117/12.604537
Event: Defense and Security, 2005, Orlando, Florida, United States

Abstract

Night vision and related thermal imaging systems play a critical role in the protection of our nation's security. These systems record images using video cameras designed for operation in the infrared (IR) region of the light spectrum. As with any imaging system, increased functionality and new information is gained when discrete portions of the observed light spectrum are analyzed separately using optical filters. Highly discriminating filters are needed to increase the sensitivity of atmospheric chemical sensors, to enable multi-spectral imaging and secure laser communications links, and to protect imaging systems from damage due to attack by high power laser weapons. Today, the performance of IR light filters is inadequate for many applications. Filters capable of efficient rejection of multiple discrete wavelength bands, combined with high transmission for wavelengths outside the rejection bands, do not exist. A new type of narrow-band optical filter capable of protecting critical imaging systems from attack from laser weapons operating at multiple wavelengths, is being developed. Based on rugged surface-structure wave-guide resonant holograms, the new filters will be capable of rejecting better than 99% of IR light within each notch, while maintaining the same level of transmission outside each notch covering a broad range of the IR spectrum. The theory, design and fabrication of surface structure, laser-line rejection and transmission filters built upon infrared transmitting materials, will be described. Optical performance data for prototype structures will be presented.

Citation Download Citation

Douglas S. Hobbs "Laser-line rejection or transmission filters based on surface structures built on infrared transmitting materials", Proc. SPIE 5786, Window and Dome Technologies and Materials IX, (18 May 2005); https://doi.org/10.1117/12.604537

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