Ferroelectric crystals with giant electro-optic property enabling ultracompact Q-switches.
basic_science · Level V
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- Record sourced from PubMed, PMID 35446634.
- Also identified by DOI 10.1126/science.abn7711.
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Abstract
Relaxor-lead titanate (PbTiO<sub>3</sub>) crystals, which exhibit extremely high piezoelectricity, are believed to possess high electro-optic (EO) coefficients. However, the optical transparency of relaxor-PbTiO<sub>3</sub> crystals is severely reduced as a result of light scattering and reflection by domain walls, limiting electro-optic applications. Through synergistic design of a ferroelectric phase, crystal orientation, and poling technique, we successfully removed all light-scattering domain walls and achieved an extremely high transmittance of 99.6% in antireflection film-coated crystals, with an ultrahigh EO coefficient <i>r</i><sub>33</sub> of 900 picometers per volt (pm V<sup>-1</sup>), >30 times as high as that of conventionally used EO crystals. Using these crystals, we fabricated ultracompact EO Q-switches that require very low driving voltages, with superior performance to that of commercial Q-switches. Development of these materials is important for the portability and low driving voltage of EO devices.