Fiber-free-space hybrid thermo-optic coefficient (TOC) measurement system that exploits the natural étalon behavior of the single-crystal 6H-SiC chip placed in air. L: laser, PBS: polarization beam splitter, QWP: quarter wave plate, SMF: single mode fiber.
Normalized power measured by the power meter in Fig. 1 as the SiC chip temperature is increased from near room temperature to 1273 K.
Plot of measured modulo- values of phase vs SiC chip temperature. The dots are the 37 data points while the solid line is the cubic fit to the data.
Calculated 6H-SiC thermo-optic coefficient (TOC) versus SiC temperature at 1550 nm using the Fig. 3 measured cubic fit data for the phase change with temperature. The TOC expression shows a quadratic dependence on the temperature.
Calculated 6H-SiC thermo-optic coefficient (TOC) versus SiC temperature at 1550 nm. Data 1 curve is from Fig. 4 using the approximate expression of Eq. (10) for TOC. Data 2 curve is using the exact expression of Eq. (7) for the TOC.
Plot of the factor in Eq. (7), i.e., the difference between Data 1 and Data 2 in Fig. 5 showing the small error introduced if TOC of 6H-SiC chip is calculated without prior knowledge of 6H-SiC refractive index.
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