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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

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Infrared Interferometry with a CO(2) Laser Source and Liquid Crystal Detection.

|January 16, 2010

Summary

This study presents a CO(2) laser-based Mach-Zehnder interferometer for capturing 2D interferograms. The novel system utilizes liquid crystals for infrared-to-optical image conversion, enabling detailed plasma jet analysis.

Area of Science:

Optics and Photonics
Laser Interferometry
Plasma Diagnostics

Background:

Infrared imaging presents challenges due to the lack of suitable detectors.
Liquid crystals offer potential for infrared-to-visible light conversion.

Purpose of the Study:

To develop and demonstrate a Mach-Zehnder interferometer system for infrared imaging.
To utilize a tunable CO(2) laser and liquid crystal technology for high-resolution interferograms.
To analyze the interference patterns of an argon plasma jet.

Main Methods:

A Mach-Zehnder interferometer was configured with a CO(2) laser source (9.1-11.3 µm).
Liquid crystals were employed for infrared-to-optical image conversion.
Two-dimensional interferograms were recorded with a 22 mm field of view.

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Main Results:

The system achieved a 1/40 sec exposure time with a detector resolution limit of <5 mW/cm(2).
Two-dimensional interferograms of an argon plasma jet were successfully recorded.
The performance of the liquid crystal infrared-optical converter was validated.

Conclusions:

The developed Mach-Zehnder interferometer system is effective for infrared imaging applications.
Liquid crystal technology provides a viable method for IR-to-visible image conversion in interferometry.
The system demonstrates potential for non-invasive diagnostics of plasma phenomena.