LENS FOR SWIR RANGE SPECTRUM Russian patent published in 2018 - IPC G02B13/14 G02B9/60 

FIELD: optics.

SUBSTANCE: lens for the SWIR range of the spectrum can be used in optoelectronic devices based on matrix photodetectors that are sensitive in the spectral range from 0.9 to 1.7 microns. Lens contains three components and an aperture diaphragm combined with the rim of the first component. First positive component contains glued biconvex and biconcave lenses. Second positive component contains a negative lens, glued together from biconvex and biconcave lenses, and a positive meniscus with a concave surface facing the plane of the images. Third component contains a negative meniscus facing a concave surface to the image plane, and a positive lens that can move along the optical axis. Difference of temperature coefficients of linear expansion of materials of glued lenses does not exceed absolute value of 3⋅10^-6 1/degree. Ratios between the optical powers of the components and the entire lens are met.

EFFECT: increase in the relative aperture, a decrease in transverse overall dimensions, an increase in the temperature interval of work.

1 cl, 6 dwg, 3 tbl