Patent
Article comprising a temperature compensated optical fiber refractive index grating
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TLDR
In this paper, a negative coefficient of thermal expansion is used to attach the grating to a support member having a negative thermal expansion coefficient, such as ZrW2 O8 or Hf-tungstate.Abstract:
Conventional optical gratings are relatively temperature sensitive. This sensitivity is generally undesirable but can be reduced or eliminated by attaching the grating to a support member having a negative coefficient of thermal expansion. Exemplarily the member comprises Zr-tungstate and/or Hf-tungstate. The thermal expansion can be tailored by admixture of positive expansion coefficient material (e.g., Al2 O3, SiO2) to the negative expansion coefficient material (e.g., ZrW2 O8), or by a variety of other techniques.read more
Citations
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Journal ArticleDOI
Two Decades of Negative Thermal Expansion Research: Where Do We Stand?
TL;DR: NTE materials that contract due to transverse atomic vibrations are reviewed, their potential for use in controlled thermal expansion composites, and known problems that could interfere with such applications are reviewed.
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TL;DR: In this paper, an athermal optical device and a method for producing the device such as an optical fiber reflective grating are described, which comprises a negative expansion substrate, an optical fibre mounted on the substrate surface, and a grating defined in the optical fiber.
References
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Journal ArticleDOI
Negative Thermal Expansion from 0.3 to 1050 Kelvin in ZrW2O8
TL;DR: Negative thermal expansion was found for ZrW 2 O 8 from 0.3 kelvin to its decomposition temperature of about 1050 klvin by using both neutron and x-ray diffraction data as mentioned in this paper.
Patent
Incorporated bragg filter temperature compensated optical waveguide device.
William Morey,Walter L. Glomb +1 more
TL;DR: In this article, a temperature compensated embedded grating optical waveguide light filtering device is proposed, in which light is guided toward a core portion of a predetermined limited length that has embedded therein a multitude of grating elements extending with a substantially equal longitudinal spacing substantially normal to the longitudinal axis and collectively constituting a grating that reflects, of the light propagating in the path toward and reaching the gating elements, that of a wavelength within a narrow range about a central wavelength determined by the spacing of the grating element and by the index of refraction of the material of the core
Journal ArticleDOI
Negative thermal expansion materials
TL;DR: In this paper, negative thermal expansion was found in a large family of materials with the general formula A 2 (MO 4 ) 3, with the potential to control other important materials properties such as refractive index and dielectric constant.
Journal ArticleDOI
Passive temperature-compensating package for optical fiber gratings.
TL;DR: A compact, passive temperature-compensating package for fiber gratings mounted under tension in a package comprising two materials with different thermal-expansion coefficients compensating the temperature dependence of the Bragg wavelength is demonstrated.
Journal ArticleDOI
Condensed Phase Relations in the Systems ZrO2‐WO2‐WO3 and HfO2‐WO2‐WO3
TL;DR: In this article, phase relations for the systems ZrO2-WO2 and WO3 from 1000° to 1700° C were determined by the quenching technique using sealed sample containers.