Patent ID: 9140901
Filing Date: 2015-09-22
Classification: G02B

Abstract:
1. A wide band beam scanning apparatus comprising: a pair of prism triplets comprising a first prism triplet and a second prism triplet, wherein the first prism triplet and the second prism triplet both include a first wedge prism, a second wedge prism and a third wedge prism, wherein the first wedge prism and the second wedge prism are formed with different optical materials; wherein components of the wide band beam scanning apparatus are arranged so that a beam passing through the wide band beam scanning apparatus first passes through the first wedge prism of the first prism triplet, then the second wedge prism of the first prism triplet, then the third wedge prism of the first prism triplet, then the third wedge prism of the second prism triplet, then the second wedge prism of the second prism triplet and then the first wedge prism of the second prism triplet; wherein the second prism triplet is rotated 180 degrees about a center point with respect to the first prism triplet so that the wide band beam scanning apparatus is configured to have a beam exiting the third wedge prism of the first prism triplet and next enter the third wedge prism of the second prism triplet before entering the first wedge prism of the second prism triplet; wherein the third angle is about 10 degrees, the second angle is about 40.3 degrees, and the first angle is about 13.95 degrees; wherein the first wedge prism is formed out of zinc sulfide (ZnS), the second wedge prism is formed out of zinc selenide (ZnSe) and the third wedge prism is formed out of gallium arsenide (GaAs).