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Recursive design for an efficient HOE with different recording and readout wavelengths.

M Assenheimer, Y Amitai, A A Friesem

|June 12, 2010

Summary

A novel recursive technique designs holographic optical elements for precise beam focusing. This method uses different wavelengths for recording and readout, achieving high diffraction efficiency and minimizing aberrations for advanced optical applications.

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Area of Science:

Optics
Holography
Optical Engineering

Background:

Holographic optical elements (HOEs) are crucial for beam manipulation.
Designing HOEs with high efficiency and low aberrations is challenging.
Traditional methods often struggle with complex wavefront generation.

Purpose of the Study:

To describe a novel recursive technique for designing holographic optical elements.
To achieve efficient focusing of collimated off-axis beams to an on-axis point.
To reduce aberrations and maximize diffraction efficiency in HOEs.

Main Methods:

A recursive design technique was employed.
Holograms were used to generate necessary aspheric recording wavefronts.
Recording and readout wavelengths were intentionally different.

Main Results:

An f/3.0 focusing element was designed and fabricated.
The element was recorded at 514.5 nm and read out at 1064 nm.
Measured spot size was 15 micrometers with ~60% diffraction efficiency.

Conclusions:

The recursive design technique is effective for creating high-performance HOEs.
The method allows for precise control over aberrations and efficiency.
This approach offers a viable solution for advanced optical system design.