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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Published on: January 28, 2019

Multiplexed phase-encoded lenses written on spatial light modulators.

J A Davis, D M Cottrell, R A Lilly

|September 15, 2009

Summary

This summary is machine-generated.

Researchers encoded Fresnel lenses onto spatial light modulators (SLMs) to precisely focus desired patterns at programmable distances. This novel method avoids imaging the inverted pattern, offering enhanced control in optical systems.

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Area of Science:

Optics and Photonics
Information Optics
Holography

Background:

Spatial Light Modulators (SLMs) are crucial for dynamic optical control.
Fresnel lenses offer unique focusing properties.
Encoding optical functions onto SLMs enables reconfigurable optical systems.

Purpose of the Study:

To demonstrate the writing of Fresnel phase-encoded lenses onto programmable SLMs.
To achieve programmable focusing of desired spatial patterns.
To overcome limitations of conventional imaging with SLMs.

Main Methods:

Developing phase-encoded Fresnel lens designs.
Writing these designs onto a magneto-optic SLM.
Analyzing the Fourier transform of the encoded pattern.
Experimental verification of focused patterns.

Main Results:

Successfully encoded Fresnel lenses onto SLMs.
Achieved programmable focusing of desired spatial patterns at selectable distances.
Demonstrated that the inverted pattern is encoded onto a diverging beam and not imaged.

Conclusions:

Programmable SLMs can effectively implement Fresnel phase-encoded lenses.
This technique allows for precise control over focal distances.
Offers a method to avoid unwanted inverted image formation in optical systems.