Nonpolarizing beamsplitter

G - Physics – 02 – B

Patent

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Details

G02B 27/10 (2006.01) G02B 5/28 (2006.01) G02B 5/30 (2006.01) G02B 27/28 (2006.01)

Patent

CA 2249610

A nonpolarizing beamsplitter (10) is provided, comprising a multilayered stack (11) of alternating layers (A, B) of a first material and a second material. The first material layers (A) are uniaxially birefringent, and the second material layers (B) are optionally uniaxially birefringent or isotropic. The layers have index of refraction relationships such that for an incident beam having a useful bandwidth, a p-polarized component and an s-polarized component striking the beamsplitter at any angle of incidence .theta. within a desired range, the beamsplitter exhibits substantially the same average reflectivity for the p-polarized component of the incident beam as for the s-polarized component. The invention also includes a method of making a nonpolarizing beamsplitter.

L'invention porte sur un séparateur de faisceau non polarisant (10), constitué d'un empilement multicouche (11) de couches alternées (A, B) faites d'un premier et d'un second matériau. Les couches faites du premier matériau (A) sont uniaxialement biréfringentes alors que celles faites du second matériau (B) sont, éventuellement, uniaxialement biréfringentes ou isotropiques. Les couches possèdent des relations d'indice de réfraction telles que si, pour un faisceau incident doté d'une largeur de bande utile, une composante à polarisation p et une composante à polarisation s heurtent le séparateur de faisceau selon n'importe quel angle d'incidence theta dans une plage désirée, ce séparateur fera sensiblement montre de la même réflectance moyenne vis-à-vis de la composante à polarisation p du rayon incident que vis-à-vis de la composante à polarisation s. Cette invention porte également sur un procédé permettant de fabriquer un séparateur de faisceau.

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