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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

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High-speed Mueller matrix ellipsometer with microsecond temporal resolution.

Song Zhang, Hao Jiang, Honggang Gu

|May 15, 2020

Summary

This summary is machine-generated.

A novel high-speed Mueller matrix ellipsometer (MME) achieves 11 µs temporal resolution using photoelastic modulator (PEM) calibration. This advanced MME enables accurate, real-time monitoring of fast chemical reactions.

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Area of Science:

Optical Physics
Materials Science
Chemical Engineering

Background:

Mueller matrix ellipsometry (MME) is crucial for characterizing material polarization properties.
Conventional MME systems often lack the temporal resolution required for dynamic processes.
Photoelastic modulators (PEMs) are key components in MME but require precise calibration.

Purpose of the Study:

To develop a high-speed MME with enhanced temporal resolution.
To introduce a novel in-situ calibration method for PEMs.
To demonstrate the accuracy and stability of the developed MME system.

Main Methods:

Development of a MME system utilizing photoelastic modulator (PEM) polarization modulation and division-of-amplitude polarization demodulation.
Implementation of a novel in-situ calibration approach combining fast Fourier transform (FFT) algorithm and Bessel function expansion for PEM.
Performance validation through static and dynamic measurement experiments.

Main Results:

Achieved a temporal resolution of 11 µs for Mueller matrix measurements.
Demonstrated high accuracy and sensitivity in PEM calibration over a wide retardance variation range.
Confirmed the high accuracy and stability of the developed MME system.

Conclusions:

The developed high-speed MME system offers unprecedented temporal resolution for Mueller matrix measurements.
The novel PEM calibration method ensures accurate and stable system performance.
This MME technology is poised to enable in-situ, real-time monitoring of rapid reaction processes.