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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

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Beam steering with two ferroelectric liquid-crystal spatial light modulators.

B Löfving¹, S Hård

¹Photonics Laboratory, Department of Microelectronics (ED), Chalmers University of Technology, S-412 96 Gothenburg, Sweden.

|December 20, 2007

Summary

Ferroelectric liquid-crystal spatial light modulators (FLC SLMs) offer fast beam steering but lose significant light. A second FLC SLM can block unwanted orders, improving efficiency for beam-steering applications.

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Area of Science:

Optics and Photonics
Materials Science

Background:

Ferroelectric liquid-crystal spatial light modulators (FLC SLMs) enable microsecond-range beam steering.
Binary modulation in FLC SLMs leads to substantial light power loss (≥60%) in unwanted diffraction orders.

Purpose of the Study:

To propose and demonstrate a method for improving the efficiency of FLC SLM-based beam steering.
To mitigate light power loss associated with binary modulation in FLC SLMs.

Main Methods:

Utilizing a second FLC SLM operating in amplitude-modulating mode.
Synchronous operation of two FLC SLMs for beam steering and order suppression.
Experimental demonstration using a simple scanner setup.

Main Results:

The proposed method effectively blocks unwanted diffraction orders.
The efficiency of the beam steerer is independent of the number of steering directions.
Successful demonstration of the enhanced beam-steering technique.

Conclusions:

A dual-FLC SLM system can overcome the inherent efficiency limitations of single binary FLC SLMs.
This approach offers a viable solution for efficient, flexible beam steering.
The method's efficiency scalability makes it suitable for diverse applications.