Lens doublet color-corrected for visible and near-infrared wavel

Details Lens doublet color-corrected for visible and near-infrared wavel Lens doublet color-corrected for visible and near-infrared wavel

1986-11-14

1987-12-15

Corbin, John K.

350481, G02B 300

Patent

active

047128860

ABSTRACT:
A lens doublet comprising a positive lens element made of calcium fluoride crystal and a negative lens element made of Schott infrared transmitting glass IRGN6 enables an object to be imaged at four wavelengths in the visible region, or at four wavelengths in the near-infrared region, or at five wavelengths in a band extending from the visible to the near-infrared region of the electromagnetic spectrum. The doublet has practically negligible secondary and higher-order spectra throughout these spectral regions.

REFERENCES:
Optical Society of America Journal; Mercado et al; vol. 71, 10-30-1981, pp. 1638-1639; vol. 72, 10-19-1982, p. 1725.

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