thermo-optic Coefficient and sensitivity sensors

[mehdi taherpoor]

Hi, everybody
in optigrating software, There are two coefficients of thermal expansion coefficient and the thermo-optic coefficient for temperature sensor design.
What are these coefficients for different materials?

To increase the sensitivity of the sensor, increasing the thermo-optic coefficient parameter causes this factor. What is the magnification of this material and how much for different materials, including aluminum?
Please tell the value of these two parameters for different materials at ambient temperature.
Also for the SMF-28 fiber, the diameter of the cladding is 62.5 micrometer and for the core 4.15 micrometers. If possible, introduce another sample of single-mode fiber with a diameter of cladding and core.
How do we choose these values ​​for the core refraction index and cladding? In terms of effective failure coefficient?
thanks.

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[Steve Dods]

I could only find one value for thermal expansion coefficient. It is shown in capture1.jpg. Its numerical value is 5.5 e-7 in this project. Where is there another value for thermal expansion coefficient? The above is the only one I know.
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