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Accurate hyper-Rayleigh scattering polarization measurements.

David P Shelton¹

¹Department of Physics and Astronomy, University of Nevada, Las Vegas, Nevada 89154-4002, USA.

The Review of Scientific Instruments

|December 2, 2011

Summary

Accurate polarization measurements of hyper-Rayleigh scattering were achieved using a novel apparatus. This method ensures 0.1% accuracy for all polarization configurations, enhancing light scattering analysis.

Area of Science:

Nonlinear Optics
Spectroscopy
Photonics

Background:

Hyper-Rayleigh scattering (HRS) is a powerful nonlinear optical technique.
Accurate measurement of polarization dependence in HRS is crucial for characterizing molecular properties.
Existing methods face challenges in achieving high accuracy across all polarization configurations.

Purpose of the Study:

To develop and validate an apparatus for precise measurement of polarization dependence in hyper-Rayleigh scattering.
To achieve high accuracy (0.1%) for all four linear polarization configurations.
To enable flexible reconfiguration for polarization and spectral measurements.

Main Methods:

Utilized a near 90° scattering angle geometry.
Employed a large collection aperture and extrapolated measurements to zero numerical aperture (NA=0).

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Implemented fiber coupling for easy system reconfiguration.

Main Results:

Demonstrated 0.1% accuracy in measuring the polarization dependence of hyper-Rayleigh scattering.
Successfully characterized all four incident and scattered linear polarization configurations.
Validated the effectiveness of the extrapolation method to NA=0.

Conclusions:

The developed apparatus provides unprecedented accuracy for polarization-dependent hyper-Rayleigh scattering measurements.
The system's design facilitates versatile applications in nonlinear optics and molecular characterization.
Extrapolation to zero NA is a viable method for accurate scattering measurements.