Related Experiment Video
Updated: Jul 7, 2026
08:39
Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
Published on: January 28, 2019
Optics for modulating multiple beams using an asymmetric multilevel phase grating and a multichannel acousto-optic
1Katsuta Research Laboratory, Hitachi Koki Corporation, Ltd., 1060 Takeda, Hitachi-Naka City, Ibaraki Prefecture 312, Japan.
Applied Optics
|February 1, 1997
Summary
Researchers designed asymmetric multilevel phase gratings to generate even-numbered beams. A fabricated four-beam grating achieved 75.5% efficiency, enabling modulation of 20-ns pulse signals.
Area of Science:
- Optics and Photonics
- Diffractive Optics
- Nanophotonics
Background:
- Generating multiple beams with controlled intensity is crucial for optical signal processing.
- Asymmetric multilevel phase gratings offer a promising approach for beam generation.
Purpose of the Study:
- To design and fabricate asymmetric multilevel phase gratings for generating even-numbered beams.
- To evaluate the performance of the fabricated grating in terms of efficiency and beam uniformity.
- To demonstrate the application of the generated beams in optical modulation systems.
Main Methods:
- Designing phase patterns by overlapping binary-phase patterns with arbitrary phase heights.
- Fabricating a grating optimized for generating four uniform and high-intensity beams.
- Integrating the grating with a multichannel acousto-optic modulator and a Fourier-transform lens.
Main Results:
- A four-beam generating grating was successfully fabricated.
- The fabricated grating achieved an efficiency of 75.5%, close to the theoretical maximum of 79.9%.
- Uniform and high-intensity diffraction orders were produced.
- Successful modulation of 20-ns pulse signals was demonstrated using the generated beams.
Conclusions:
- Asymmetric multilevel phase gratings are effective for generating multiple, uniform beams.
- The fabricated grating shows high efficiency and practical applicability in optical modulation.
- This technology has potential for high-speed optical signal processing applications.
