Figure 5: Microstructuring of 6 at% Ge fibres during recrystallization. | Nature Communications

Figure 5: Microstructuring of 6 at% Ge fibres during recrystallization.

From: Laser recrystallization and inscription of compositional microstructures in crystalline SiGe-core fibres

Figure 5

(a) XCT cross section of a Ge-rich lobe formed by melting the core and gradually reducing the laser power density, (b) XCT side view of the centre of the Ge-rich region, (c) Ge-rich grating formed in the fibre core by periodically interrupting the laser beam. The angle of the grating is due to the asymmetric heating and resultant tilted solidification boundary. (d) Power versus distance for the germanium grating process. (e) Intensity profile for the grating in f, where the dashed lines highlight the alignment. The upward slope is an unsubtracted background effect. (f) Si-rich regions formed by periodic variation of the velocity during recrystallization and (g) velocity profile during formation of the grating. (h) Taper formed during recrystallization of a fibre with an initial core diameter of 20 μm, made by applying stress to the fibre during laser heating (Scale bar, 200 μm).

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