Beam splitter and optical coupler using the same

Details Beam splitter and optical coupler using the same Beam splitter and optical coupler using the same

G - Physics

02

B

G02B 27/10 (2006.01) G02B 6/132 (2006.01) G02B 6/26 (2006.01) G02B 6/28 (2006.01) G02B 27/14 (2006.01) G02B 6/12 (2006.01)

Patent

CA 2137972

A beam splitter is an optical multilayer film obtained by sequentially stacking first to fifth layers respectively having refractive indexes of n1 to n5 and geometrical thicknesses d1 to d5 on a substrate having a refractive index n G. The refractive indexes of the substrate and the first to fifth layers satisfy any one of a relationship of n G = 1.45 to 1.60, n1 = 2.02 to 2.20, n2 = 2.25 to 2.38, n3 = 1.44 to 1.47, n4 = 2.25 to 2.38, and n5 = 1.44 to 1.47, a relationship of n G = 1.45 to 1.60, n1 = 1.44 to 1.47, n2 = 2.25 to 2.38, n3 = 1.44 to 1.47, n4 = 2.25 to 2.38, and n5 = 2.02 to 2.20, and a relationship of n G = 1.45 to 1.60, n1 = 1.44 to 1.47, n2 = 2.25 to 2.38, n3 = 2.02 to 2.20, n4 = 2.25 to 2.38, and n5 = 1.44 to 1.47, and a geometrical thickness d i of an ith layer of the first to fifth layers satisfies relation n i d i cos(.theta.i) = .lambda./4, where n i is a refractive index of the ith layer, .theta.i is an angle of refraction in the ith layer, and .lambda. is a center wavelength of an incident light beam to the multilayer film with an angle of incidence of 40° to 50°.

L'invention est un diviseur de faisceau constitué par un film multicouche obtenu en empilant sur un substrat ayant un indice de réfraction nG cinq couches ayant respectivement des indices de réfraction n1 à n5 et des épaisseurs d1 à d5. Les indices de réfraction du substrat et des cinq couches satisfont à l'un quelconque des ensembles de relations suivants : 1,45 nG 1,60, 2,20 n1 2,20, 2,25 n2 2,38, 1,44 n3 1,47, 2,25 n4 2,38, 1,44 n5 1,47; ou 1,45 nG 1,60, 1,44 n1 1,47, 2,25 n2 2,38, 1,44 n3 1,47, 2,25 n4 2,38, 2,02 n5 2,20; ou 1,45 nG 1,60, 1,44 n1 1,47, 2,25 n2 2,38, 2,02 n3 2,20, 2,25 n4 2,38, 1,44 n5 1,47. Dans ces ensembles de relations, l'épaisseur di de la couche i satisfait à la relation nidi cos i = /4, où ni est l'indice de réfraction de la couche i, i est l'angle de réfraction dans la couche i et est la longueur d'onde centrale du faisceau de lumière qui tombe sur le film multicouche à un angle d'incidence allant de 40° à 50°.

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