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A continuously variable beam expander driven by ultrasonic motors.

Zhangfan Xu¹, Song Pan¹, Lei Chen¹

¹State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.

The Review of Scientific Instruments

|October 3, 2019

Summary

This summary is machine-generated.

A novel variable beam expander utilizes ultrasonic motors for precise laser beam shaping. This system achieves nanoscale positioning and continuous threefold to fivefold expansion, enhancing dynamic optical applications.

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Area of Science:

Optics
Mechanical Engineering
Materials Science

Background:

Dynamic beam shaping systems necessitate variable beam expanders.
Traditional expanders may lack precision or speed for certain applications.

Purpose of the Study:

To develop and assess a novel variable beam expander for dynamic beam shaping.
To integrate ultrasonic motors for high-precision lens positioning.

Main Methods:

Designed a beam expander using three optical lenses.
Incorporated two hollow ultrasonic motors with polymer-based stators for reduced weight.
Machined a prototype and evaluated its performance characteristics.

Main Results:

The beam expander demonstrated rapid start/stop times within 0.05 seconds.
Achieved a minimum positioning error of 0.03 µm through motor speed adjustment.
Successfully realized continuous threefold to fivefold laser beam expansion.

Conclusions:

Ultrasonic motors enable nanoscale positioning for high-precision beam shaping.
The developed variable beam expander meets the requirements for dynamic optical systems.
The lightweight design with polymer stators enhances motor performance.