Diffractive optical element, and optical system and optical...

Details Diffractive optical element, and optical system and optical... Diffractive optical element, and optical system and optical...

2005-08-09

2005-08-09

Robinson, Mark A. (Department: 2872)

Optical: systems and elements

Diffraction

From grating

C359S575000

Reexamination Certificate

active

06927915

ABSTRACT:
A diffractive optical element of the blazed-binary grating type is disclosed, with which a high diffraction efficiency can be achieved over substantially the entire used wavelength region. The diffractive optical element has a periodic structure taking a grating unit including a plurality of grating portions with different grating width and grating interval as one period. The diffraction element further includes a plurality of first grating portions made of a first material and a plurality of second grating portions made of a second material having a different refractive index than the first material that are arranged between the first grating portion.

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