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Updated: Jun 24, 2026

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

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

Published on: January 28, 2019

1.5% root-mean-square flat-intensity laser beam formed using a binary-amplitude spatial light modulator.

Jinyang Liang¹, Rudolph N Kohn, Michael F Becker

¹Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, Texas 78712, USA. jinyang.liang@mail.utexas.edu

|April 3, 2009

Summary

This summary is machine-generated.

Researchers developed a digital micromirror device (DMD) optical system to create super-Lorentzian flat-top beams. This flexible method achieves high beam flatness, crucial for applications like cold atom experiments.

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Area of Science:

Optical Physics
Atomic, Molecular, and Optical Physics

Background:

Generating uniform optical beams is essential for precision experiments.
Traditional methods for creating flat-top beams can be complex and lack flexibility.

Purpose of the Study:

To demonstrate a digital micromirror device (DMD)-based optical system for generating eighth-order super-Lorentzian flat-top beams.
To achieve high beam flatness and power conversion efficiency.

Main Methods:

Utilized a digital micromirror device (DMD) with an error-diffusion algorithm to design a binary pattern.
Employed a telescope with a pinhole for low-pass filtering and beam scaling.
Developed an alignment technique for precise DMD pattern positioning.

Main Results:

Achieved 1% root-mean-square (RMS) flatness over a 0.28 mm diameter and 1.5% RMS flatness over the entire 1.43 mm diameter.
Obtained a power conversion efficiency of 37%.
Confirmed phase uniformity in the output beam through interferometric measurements.

Conclusions:

The DMD-based system offers a flexible and efficient method for generating super-Lorentzian flat-top beams.
The technique can be adapted to produce various beam shapes and parameters.
This technology is suitable for generating homogeneous optical lattices for Bose-Einstein condensate experiments.