Diffractive optical element and method of its formation

Details Diffractive optical element and method of its formation Diffractive optical element and method of its formation

2003-08-25

2009-08-11

Pritchett, Joshua L (Department: 2872)

Optical: systems and elements

Diffraction

From grating

C359S576000

Reexamination Certificate

active

07573638

ABSTRACT:
Practical diffractive optical elements are made available efficiently and at low-cost. A refractive-index-modulated diffractive optical element includes a transparent DLC (diamond-like carbon) film (2) formed on a transparent substrate (1), with the DLC film (2) containing a diffraction grating having local regions (2a) of a relatively high refractive index and local regions (2) of a relatively low refractive index. The DLC film (2) can readily be deposited by plasma CVD onto the substrate (1), and the high refractive-index regions (2a) within the DLC film can readily be formed by irradiating it with an energy beam (4) such as an ion beam.

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