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Kinoform with 64 phase levels for use as an array generator.

L Pin, H Dahsiung, W Minxian

|October 2, 2009

Summary

A 64-level transmissive kinoform was developed to generate a 5x5 beam array from a single beam. This beam array generator achieved 75.56% diffraction efficiency, demonstrating its effectiveness.

Area of Science:

Optics and Photonics
Diffractive Optics
Beam Shaping

Background:

Kinoforms are diffractive optical elements that can manipulate light wavefronts.
Beam array generation is crucial for applications like optical interconnects and parallel processing.
Multi-level phase kinoforms offer improved diffraction efficiency and flexibility compared to binary elements.

Purpose of the Study:

To design and demonstrate a transmissive kinoform capable of generating a 5x5 beam array.
To evaluate the performance of the kinoform in terms of diffraction efficiency and intensity uniformity.
To assess the practical application of a multi-level phase kinoform as a beam array generator.

Main Methods:

A 64-phase-level transmissive kinoform was designed using diffractive optics principles.

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The kinoform was fabricated with a total aperture of 10 mm x 10 mm.

Experimental characterization was performed to measure diffraction efficiency and intensity distribution of the generated beam array.

Main Results:

The fabricated kinoform successfully converted a single input beam into a 5x5 beam array.
Measured diffraction efficiency was 75.56%, closely matching the designed value of 79.68%.
The measured intensity difference among the diffraction orders of the 5x5 array was 21.56%, with a designed value of 10.99%.

Conclusions:

The demonstrated 64-phase-level transmissive kinoform is an effective beam array generator.
The achieved diffraction efficiency is comparable to the designed specifications.
Further optimization may be needed to improve intensity uniformity across the beam array.