Methods and means for reducing temperature-induced...

G - Physics – 02 – C

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G02C 7/02 (2006.01) G02B 3/08 (2006.01) G02B 5/18 (2006.01) G02B 27/00 (2006.01)

Patent

CA 2128328

A lens (10) imposed of a single material and having at least one refractive surface (14) on one face and a kinoform (20) on the other face(16). The pure refraction between the surfaces varies dimensionally and in refractive index in response to temperature changes and thereby-changes characteristics, such as the back focal length, of the lens while the kinoform varies differently in response to the same temperature changes. The kinoform power is sufficient to vary the temperature induced characteristic changes of the lens in an opposing sense at a given wavelength and in an amount sufficient to athermalize the optical device. In one embodiment the kinoform power compensates for the combined temperature- induced effects upon the refractive portion and any mount that supports the lens:

Lentille (10) composée d'un matériau unique et comprenant au moins une surface réfléchissante (14) sur une face, et une partie de diffraction (20) sur l'autre face (16). La réfraction pure entre les surfaces varie en dimension et en indice de réfraction en réponse à des variations de température, et modifie ainsi des caractéristiques de la lentille, telles que la distance focale postérieure, alors que la partie de diffraction varie de manière différente en réponse aux mêmes variations de température. La puissance de la partie de diffraction est suffisante pour modifier dans le sens opposé les variations des caractéristiques de la lentille induites par la température, à une longueur d'onde donnée, et par une valeur suffisante pour rendre athermique le dispositif optique. Selon un mode de réalisation, la puissance de la partie de diffraction annule les effets combinés induits par la température sur la partie réfléchissante et sur tout élément de montage supportant la lentille.

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