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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

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Temperature-dependent index-of-refraction changes in BaTiO(3).

D W Rush, B M Dugan, G L Burdge

|September 25, 2009

Summary

Optical absorption in Barium Titanate (BaTiO3) crystals significantly alters their refractive index due to thermal effects. This study quanties the temperature and refractive index changes caused by a 900-mW beam.

Area of Science:

Materials Science
Optics
Solid State Physics

Background:

Barium Titanate (BaTiO3) is a widely studied ferroelectric material with significant optical properties.
Understanding its behavior under optical illumination is crucial for applications in nonlinear optics and photonics.
Thermal effects can significantly influence the optical characteristics of materials like BaTiO3.

Purpose of the Study:

To investigate the thermally induced changes in the index of refraction of BaTiO3.
To quantify the relationship between optical absorption, temperature change, and refractive index change.
To analyze the time-dependent thermal behavior and its impact on phase-conjugate mirror performance.

Main Methods:

Irradiation of a BaTiO3 crystal with a 900-mW optical beam.

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Measurement of surface temperature changes.

Measurement of the extraordinary index of refraction.

Observation of time-dependent changes in temperature and refractive index.

Analysis of the contribution of thermal effects to phase-conjugate mirror dynamics.

Main Results:

Absorption of a 900-mW beam increased BaTiO3 surface temperature by over 40°C.
The extraordinary index of refraction changed by more than 10^-2.
Unmounted crystals showed continuing temperature and index changes for over 10 minutes.
Thermally induced index changes partially explain frequency shifts in self-pumped phase-conjugate mirrors operating out of thermal equilibrium.

Conclusions:

Optical absorption in BaTiO3 leads to significant, measurable thermal effects.
These thermal effects directly impact the material's refractive index.
The time-dependent nature of these thermal changes is important for understanding dynamic optical processes in BaTiO3, particularly in phase-conjugate mirrors.