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Due to the growing demand for sustainable energy, thermoelectric (TE) technology that directly converts unserviceable waste heat into available electricity is gaining traction. [1][2][3][4] However, the widespread use of TE technology is severely hampered by its relatively low energy conversion efficiency, [5] which depends on the composed material's figure of merit zT ¼ κα 2 T/κ, where α, σ, κ, and T are the Seebeck coefficient, electrical conductivity, total thermal conductivity (including the lattice contribution κ L and the carrier contribution κ e ), and absolute temperature, respectively. [2,3,6] However, in view of the sophisticated competitive relationship between α, σ, and κ, it is currently an overwhelming challenge to achieve considerable progress in zT.Recently, the orthorhombic SnSe has received extensive attention due to its ultrahigh zT % 2.8. [7] The remarkable lattice anharmonicity evoked by the interestingly layered structure of SnSe is the main reason for its ultralow κ L and distinguished zT. [8] In consideration of the similar crystal

We report on optical waveguides produced by a femtosecond laser in 6H–SiC crystals. Their guiding properties have been investigated at a wavelength of 1064 nm, and confocal micro-Raman images have been obtained at an excitation wavelength of 532 nm. The results demonstrate that mode profiles can be tailored by the adjustment of writing parameters, and the blueshift of the spectrum (at around 787.05 cm−1) mainly takes place in the irradiated areas. From images of Raman intensity and spectral shift, it is obvious that optical properties in guiding regions are well preserved. These waveguides may have potential applications in integrated optics and quantum photonics.

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