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Long-wavelength first hyperpolarizability measurements by hyper-Rayleigh scattering.

S Stadler, R Dietrich, G Bourhill

|October 30, 2009

Summary

We measured the first hyperpolarizability (beta) of Crystal Violet dye using a novel hyper-Rayleigh scattering system. Its resonance-free value (beta(0)) is comparable to Disperse Red 1, but with a poorer nonlinearity-transparency trade-off.

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Area of Science:

Nonlinear Optics
Molecular Spectroscopy
Materials Science

Background:

Hyper-Rayleigh scattering (HRS) is a powerful technique for measuring molecular hyperpolarizabilities.
Understanding molecular nonlinear optical properties is crucial for developing advanced optical materials.
Crystal Violet (CV) is an octupolar dye with potential applications in nonlinear optics.

Purpose of the Study:

To describe a novel HRS system utilizing an optical parametric power oscillator.
To measure the first hyperpolarizability (beta) of Crystal Violet dye at specific infrared wavelengths.
To investigate the resonance-free hyperpolarizability (beta(0)) and compare it with dipolar dyes and previous reports.

Main Methods:

Development and implementation of a custom hyper-Rayleigh scattering (HRS) system.
Optical parametric power oscillator (OPO) used as a light source for HRS measurements.
Spectroscopic analysis of Crystal Violet dye in solution to determine its first hyperpolarizability (beta).

Main Results:

The first hyperpolarizability (beta) of Crystal Violet dye was successfully measured at 1450 and 1500 nm.
The resonance-free beta value (beta(0)) for the octupolar Crystal Violet was found to be comparable to the dipolar dye Disperse Red 1.
The nonlinearity-transparency trade-off for Crystal Violet was observed to be less favorable than for Disperse Red 1.

Conclusions:

The study provides a new HRS system for nonlinear optical measurements.
The findings clarify discrepancies in reported beta(0) values for Crystal Violet, attributing them to resonance effects and model adequacy.
The investigation highlights the importance of considering dye aggregation and solvent effects in HRS measurements.