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Design of array of diffractive optical elements with inter-element coherent fan-outs.

Johan Stigwall, Jörgen Bengtsson

|June 3, 2009

Summary

A new algorithm designs diffractive optical element (DOE) arrays ensuring coherent light output from neighboring elements. This method enables smooth data read-out in scanning applications without sacrificing optical performance.

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Area of Science:

Optics
Diffractive Optics
Optical Engineering

Background:

Diffractive optical elements (DOEs) are crucial for manipulating light.
Designing arrays of DOEs for specific applications, like fan-out patterns, presents challenges.
Ensuring coherent light output between adjacent DOEs is vital for applications involving scanning beams.

Purpose of the Study:

To develop an algorithm for designing inter-element coherent arrays of diffractive optical elements (DOEs).
To enable fan-out DOE arrays where individual elements share common fan-out points.
To ensure in-phase light from neighboring DOEs for smooth data read-out during beam scanning.

Main Methods:

Building upon the optimal-rotation-angle method.
Developing an algorithm that iteratively optimizes the entire DOE array.
Implementing a design that ensures neighboring DOEs produce in-phase light at common fan-out points.

Main Results:

The proposed algorithm successfully designs inter-element coherent DOE arrays.
Simulations demonstrate that the in-phase condition can be achieved with minimal impact on optical performance.
The method is particularly effective for fan-out DOE arrays used in scanning applications.

Conclusions:

The developed algorithm provides a robust method for designing coherent DOE arrays.
Inter-element coherence in DOE arrays is achievable without significant performance degradation.
This advancement facilitates smoother information read-out in laser scanning systems utilizing DOE arrays.