There is a strong desire to reduce size and weight of single and multiband IR imaging systems in ISR operations on hand-held, helmet mounted or airborne platforms. NRL is developing new IR glasses that transmit from 0.9 to > 12 µm in wavelength, with refractive index ranging from 2.38 to 3.17, to expand the glass map and provide compact solutions to multispectral imaging systems. These glasses were specifically designed to have comparable glass molding temperatures and thermal properties so that they can be laminated and co-molded into optics with reduced number of air-glass interfaces (lower Fresnel reflection losses). These new NRL glasses also have negative or very low dn/dT, making it easier to athermalize the optical system. Our multispectral optics designs using these new materials demonstrate reduced size, complexity and improved performance. The glass database is now available for distribution. Some of the NRL glasses are also available commercially. This presentation will cover discussions on the new optical materials, multispectral designs, as well fabrication and characterization of new optics.
Shyam S. Bayya, Daniel Gibson, Vinh Nguyen, Jasbinder Sanghera, Mikhail Kotov, and Collin McClain, "NRL glasses for multispectral optics designs (Conference Presentation)," Proc. SPIE 10627, Advanced Optics for Defense Applications: UV through LWIR III, 1062706 (Presented at SPIE Defense + Security: April 15, 2018; Published: 14 May 2018); https://doi.org/10.1117/12.2305728.5783257694001.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon