G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 5/18 (2006.01) H04J 14/02 (2006.01)
Patent
CA 2703119
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<=n<=n2" or "n3<=n1<=n2, n3 < n4 < n2".
Shigehara Masakazu
Shiozaki Manabu
Marks & Clerk
Sumitomo Electric Industries Ltd.
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