Diffraction grating element, production method of...

Details Diffraction grating element, production method of... Diffraction grating element, production method of...

G - Physics

02

B

G02B 5/18 (2006.01) G02B 6/12 (2006.01) G02B 6/34 (2006.01)

Patent

CA 2480350

In a diffraction grating element 10, between a first medium 11 and a fourth medium 14, a second medium 12 and a third medium 13 are disposed alternately to form a diffraction grating. The light, which enters the diffraction grating from the first medium 11, is diffracted at the diffraction grating portion and output to a fourth medium 14. Or, the light, which enters the diffraction grating from the fourth medium 14, is diffracted at the diffraction grating portion and output to the first medium 11. The index of refraction n1-n4 of each medium satisfies a relational expression of "n3<n1<n2, n3<=n4<=n2" or n3<=n1<=n2, n3<n4<n2".

L'invention concerne un élément de réseau diffracteur (10), dans lequel un réseau diffracteur est formé par la fourniture d'un deuxième (12) et d'un troisième (13) supports en alternance entre un premier (11) et un quatrième (14) supports. Une lumière réverbérée dans un réseau diffracteur à partir du premier (11) support est diffractée par une unité de réseau diffracteur et sortie vers le quatrième (14) support, ou, une lumière réverbérée dans un réseau diffracteur à partir du quatrième (14) support est diffractée par une unité de réseau diffracteur et sortie vers le premier (11) support. Les indices de réfraction n1-n4 des supports correspondants satisfont aux relations [n¿3?<n¿1?<n¿2?, n¿3?<=n¿4?<=n¿2?] ou [n¿3?<=n¿1?<=n¿2?, n¿3?<n¿4?<n¿2?].

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