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PreprintCC BY 4.0arXiv

Accurate measurement of Lithium Tantalate birefringence in whispering gallery resonators

  • Linjie Shao
  • Andrey B. Matsko
  • Anatoliy A. Savchenkov
  • Harald G. L. Schwefel
  • Nicholas J. Lambert
  • Florian Sedlmeir
  • Dmitry V. Strekalov
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Abstract

Lithium Tantalate (LTA) is an important ferroelectric crystal widely used in piezoelectric, electro-optic, and nonlinear optical devices. Although this crystal is very common, there is an ongoing debate regarding its birefringence magnitude, and even its sign. While some sources claim it to be negative, others maintain that it is positive. The issue is further complicated by the sample-to-sample variation in the crystal composition, ranging from congruent to stoichiometric. Here we report the experimental exploration of this question based on high-resolution spectroscopy of optical whispering gallery resonators fabricated from this crystal. These sensitive measurements unambiguously indicate that in the near-infrared range at room temperature the stoichiometric LTA is negative, while the congruent LTA is positive.

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Cite

BibTeXRIS
BibTeX
@misc{shao2026accurate,
  title = {{Accurate measurement of Lithium Tantalate birefringence in whispering gallery resonators}},
  author = {Linjie Shao and Andrey B. Matsko and Anatoliy A. Savchenkov and Harald G. L. Schwefel and Nicholas J. Lambert and Florian Sedlmeir and Dmitry V. Strekalov},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.33855},
  eprint = {2610.33855},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.33855},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Accurate measurement of Lithium Tantalate birefringence in whispering gallery resonators
AU  - Linjie Shao
AU  - Andrey B. Matsko
AU  - Anatoliy A. Savchenkov
AU  - Harald G. L. Schwefel
AU  - Nicholas J. Lambert
AU  - Florian Sedlmeir
AU  - Dmitry V. Strekalov
PY  - 2026
DA  - 2026/10/24
PB  - arXiv
DO  - 10.48550/arxiv.2610.33855
UR  - https://arxiv.org/abs/2610.33855
AB  - Lithium Tantalate (LTA) is an important ferroelectric crystal widely used in piezoelectric, electro-optic, and nonlinear optical devices. Although this crystal is very common, there is an ongoing debate regarding its birefringence magnitude, and even its sign. While some sources claim it to be negative, others maintain that it is positive. The issue is further complicated by the sample-to-sample variation in the crystal composition, ranging from congruent to stoichiometric. Here we report the experimental exploration of this question based on high-resolution spectroscopy of optical whispering gallery resonators fabricated from this crystal. These sensitive measurements unambiguously indicate that in the near-infrared range at room temperature the stoichiometric LTA is negative, while the congruent LTA is positive.
ER  -