Thermorefringent noise in crystalline optical materials
Name
PhysRevD.107.022001.pdf
Description
Published version
Size
615.66 KB
Format
Adobe PDF
Checksum (MD5)
5a9d2faaee76e2a3b5bfd396796a6db5
Author(s)
Kryhin, Serhii
Hall, Evan D.
Sudhir, Vivishek
Date Issued
January 3, 2023
Journal
Physical Review D
Publisher
American Physical Society
Citation
Kryhin, Serhii, Hall, Evan D. and Sudhir, Vivishek. 2023. "Thermorefringent noise in crystalline optical materials." Physical Review D, 107 (2).
Version
Final published version
Abstract
Crystalline materials are increasingly employed to construct precision optical instruments because of their reduced mechanical dissipation and consequent reduction of thermal Brownian noise. However, the anisotropy of the crystalline state implies a fundamental source of thermal noise; depolarization induced by thermal fluctuations of its birefringence. We establish the theory of this effect, which is a generalization of prior treatments of thermo-optic noises in amorphous materials. This theory—in conjunction with poorly understood anisotropic thermal stress coefficients of crystalline coatings—predict that thermo-refringent noise in crystalline mirror coatings may be lurking within an order of magnitude of Brownian noise (below 100 Hz). Thus, in order to appreciate the full promise of crystalline optical materials, a more precise understanding of their anisotropic material constants is necessary. Barring that, we elucidate measurement techniques that can affect partial coherent cancellation of thermorefringent noise. In passing, our general formalism also predicts the existence of thermal beam-pointing noise.
MIT Department
Massachusetts Institute of Technology. Department of Physics
LIGO (Observatory : Massachusetts Institute of Technology)
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1103/physrevd.107.022001
