In previous work, laminated midwave infrare imagers were designed and manufactured. These systems used the technique of laminating a piece of plastic on to a silicon substrate lens and then single-point diamond turning an aspheric/diffractive surface on the plastic. These lenses had a focal length of 50 mm and f/# of 2.6. This paper updates the progress of the developing prototype to show initial results of compression molding the aspheric/diffractive surface onto the plastic laminated surface. The results of the previous built imagers will be compared to the ones that have been molded.
It was previously reported that a midwave infrared (IR) imager with silicon lenses and a flat laminated plastic surface had been made. It had a focal length of 50 mm and f/# of 2.6. This paper updates the progress of the developing prototype with MTF, transmission measurements, and a design philosophy for strong absorptions regions in a material.
A midwave infrared (IR) imager with silicon lenses and a laminated plastic surface has been made. It has a focal length of 50 mm and f/# of 2.6. Typically this type of lens system would be made out of silicon, germanium, or some other materials transparent in the midwave infrared regime. The design of the lens system would include aspheric and/or diffractive surfaces that require the use of a single point diamond turning machine to make it. In this system aspheric/diffractive silicon lenses have been replaced with a flat piece of silicon coated with a thin layer of plastic that has an aspheric/diffractive surface.
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